National Contributions on benefit income at household-level

This appendix describes the microdata-level calculation of National Contributions revenue from benefit income. The analysis operates on individual Family Resources Survey records aggregated to households, applies a per-child allowance at household level against a taxable benefit base, and reports revenue by household type, quintile of the NC Total Income distribution, and their intersection.

*A note on the source data before the detail. The Family Resources Survey microdata underlying this appendix is known to undercount benefit receipt: DWP's FRS Transformation research documents an average 37 per cent undercoverage of benefit caseload in survey responses relative to administrative records, a gap only partially closed by administrative data linkage from FRS 2024-25 onwards. The headline figure in this appendix is therefore more likely understated than overstated. The Limitations section quantifies this alongside the partially offsetting Cost of Living Payment artefact in the 2022-23 base year. A future update using FRS 2024-25 is scheduled for later in 2026. *

Design principle

Prosperity 2030 advances the proposition that public money spent on Universal Services is more effective and efficient at meeting need and reducing the cost of living than equivalent expenditure on compensatory cash redistribution. The programme takes the first steps on a longer trajectory of fiscal reorientation that developed economies will need to pursue for long-run budgetary sustainability, given that the current configuration of cash-benefit-centric redistribution paired with chronic deficits is unsustainable in most developed nations.

Applying National Contributions to benefit income is the fiscal mechanism for this reorientation. It brings benefit income within the NC base on the same principle as any other income stream: participation in the economic surplus entails a contribution to the collective provision from which everyone benefits. Rather than a direct reduction of benefits, the mechanism frames the shift as a collective recalibration — cost-of-living is being reduced through Universal Services; each recipient of benefit income makes an individual contribution to that collective effort through NC.

The design consequence is that the default position is to include benefit income in the NC base. Exclusions require a specific justification rooted in the programme's own logic. The only exclusion warranted on that basis is for benefits that compensate for specific additional costs that Universal Services can reduce but cannot reasonably substitute for, principally disability-related costs.

The FRS benefit components

The main tax model uses five benefit components, each derived from Family Resources Survey variables and annualised by multiplying weekly values by 52. The components are analytical groupings of multiple individual entitlements:

• Ben_NI = max(0, INNIRBEN − INRPINC) × 52 — contributory National Insurance benefits excluding state pension. Includes contribution-based Jobseeker's Allowance, contribution-based Employment and Support Allowance, Incapacity Benefit, Carer's Allowance, Bereavement Allowance, Widowed Parent's Allowance, Maternity Allowance and related contributory benefits. State pension (INRPINC) is treated separately as non-benefit income and subtracted here to prevent double-counting.

• Ben_Oth = INOTHBEN × 52 — other non-contributory means-tested benefits. Includes Income Support, Housing Benefit, Pension Credit, Council Tax Support, Winter Fuel Payment, Industrial Injuries Benefit, Guardian's Allowance, and other statutory means-tested payments not captured in the other categories.

• Ben_Dis = INDISBEN × 52 — disability benefits. Includes Personal Independence Payment, Disability Living Allowance, Attendance Allowance, and related disability-specific payments that compensate for the additional cost of living with a disability.

• Ben_TC = intxcred × 52 — legacy tax credits: Working Tax Credit and Child Tax Credit, both being phased out and replaced by the corresponding elements of Universal Credit.

• Ben_UC = induc × 52 — Universal Credit, including the standard allowance and all element-specific additions (housing, childcare, child, limited capability for work, and carer).

Each FRS component therefore aggregates multiple distinct entitlements into a single analytical category. The appendix uses these categories because they are the granularity at which FRS microdata is available; they do not separate the constituent entitlements.

Taxable benefit base

Under the principle articulated above, disability benefits are excluded from the taxable benefit base. All other components are retained:

hh_benefit_income_taxable = ben_ni + ben_oth + ben_tc + ben_uc   (summed to household)
hh_disability_benefits     = ben_dis                             (tracked but exempt)

Disability benefits are not a form of consumption support that Universal Services could substitute for in full — adapted equipment, additional heating costs, personal care requirements, and transport costs for people with restricted mobility are irreducible additional costs of living with a disability. Universal Services can materially reduce them but cannot eliminate them. Excluding Ben_Dis from the NC base respects that principle and mirrors the current UK practice under which PIP, DLA and Attendance Allowance are non-taxable.

Aggregate benefit income (uprated to 2025-26):

Disability benefits represent 16 per cent of total benefit income in FRS. 4.35 million households (15 per cent) receive some disability benefit.

A note on granularity and implementation

The five FRS components cluster entitlements that, at finer granularity, would be amenable to further distinction under the same principle. The disability premia within Universal Credit (reported within induc rather than INDISBEN) fall under the taxable base here even though they function analogously to Ben_Dis. Carer's Allowance (inside Ben_NI) compensates for a form of additional cost — the opportunity cost of informal caregiving — that has some extra-expense character. Industrial Injuries Benefit (inside Ben_Oth) compensates for work-caused disability. Maternity Allowance (inside Ben_NI) compensates for a specific period of earnings interruption.

The same granularity limitation affects the pensioner picture in particular. Ben_Oth for pensioner households typically includes small annualised amounts reflecting Winter Fuel Payment, Christmas Bonus, and in some cases Council Tax Support, which together mean that nearly all pensioner households register as receiving "other means-tested benefits" even though the amounts are modest for most. Ben_NI for pensioners includes small contributory additions such as Graduated Retirement Benefit and SERPS top-ups, which are effectively state-pension extensions for older cohorts rather than additional income streams. At the pensioner-population level, this inflates the apparent prevalence of benefit receipt and contributes a small amount (of the order of a few hundred million pounds) to the headline NC on benefits figure.

These distinctions cannot be made reliably with the FRS aggregates used here. A full implementation of NC would apply the extra-expense test at individual-entitlement level using administrative data, which would shift a modest additional amount of benefit income out of the taxable base. The revenue implication is small — the aggregate of these sub-components is of the order of several billion pounds — but the principle is important and should be reflected in the final design.

For the purposes of this report, the only exclusion applied is for the Ben_Dis component. This is a modelling simplification rather than a final policy position. The implementation specification should revisit each constituent entitlement against the extra-expense test at the legislative stage.

Per-child allowance

The taxable benefit base is further reduced by a per-child allowance, designed to ensure that the NC mechanism does not disproportionately fall on households raising children. Each dependent child contributes £12,570 to the household's allowance against its taxable benefit income:

hh_allowance = dependent_children × £12,570

No separate adult allowance applies against the benefit base, because each adult is already protected by their individual VNC threshold on their share of NC Total Income. The child allowance is therefore a targeted protection for households whose benefit income is elevated specifically because of dependent children. The £12,570 per-child value matches the Voluntary NC (VNC) threshold, providing a single parameter governing the protective amount in both places.

A household's NC on benefits is then:

excess         = max(0, hh_benefit_income_taxable − hh_allowance)
NC_on_benefits = excess × NC_marginal_rate

where NC_marginal_rate is the rate applicable at the highest NC percentile rank among the adults in the household. Using the primary adult's marginal rate is consistent with the treatment of benefit income in the main tax model.

Why a household-level calculation is needed

The allowance depends on the number of dependent children in the household, and the VNC threshold on adult income is individual. At percentile-table level, both the per-percentile mean benefit income and the per-percentile household composition are averages across heterogeneous populations within a single percentile. Subtracting a per-child allowance from an average before taxing produces a very different answer from the correct calculation, which subtracts the allowance at each household individually and aggregates the results.

The discrepancy is substantial. The per-percentile tax-comparison model, by applying the marginal rate to all benefit income with no household-level allowance, produces a gross figure several times larger than the household-level calculation with disability exemption and per-child allowance. The headline NC revenue figures in the report rely on the household-level figure; the per-percentile model is a diagnostic that shows the upper bound of benefit income subject to NC before protective mechanisms are applied.

Household type classification

Households are classified into five categories using the FRS derived variable hhcomps:

The FRS hhcomps variable uses a pensioner/working-age cut-off consistent with DWP conventions; it classifies working pensioners by their employment status rather than strictly by age. All five categories are mutually exclusive and collectively exhaustive for the 16,754 sampled households (weighted to 28.78 million UK households).

Data and method

Source data. Family Resources Survey 2022-23 (SN 9367): 28,590 adult records merged with 16,754 household records via SERNUM. The merge attaches household size (adulth), dependent child count (depchldh) and household composition (hhcomps) to each adult record.

Per-individual income components are annualised (×52) and uprated to 2025-26 using the factors in the main tax model: earnings approximately 10 per cent, state pension 18.1 per cent, benefits 10.1 per cent. Investment income and dividends are scaled for FRS coverage (factors 1.56 and 1.79 respectively).

NC percentile assignment. Individuals are sorted by uprated NC Total Income (non-benefit basis including inheritance and capital gains allocated from base percentile data) using the grossing weight gross4. Percentiles 1–100 are assigned cumulatively, and each individual receives an NC marginal rate at their percentile position (Base rate applied at P50, Top rate applied at P90, linear interpolation between anchors). The specific Base and Top rate values are policy parameters set in the main report.

Household aggregation. For each household:

• hh_benefit_income_all = sum of all five benefit components across adults
• hh_benefit_income_taxable = sum of Ben_NI + Ben_Oth + Ben_TC + Ben_UC (excluding Ben_Dis)
• hh_disability_benefits = sum of Ben_Dis across adults
• hh_allowance = dependent_children × £12,570
• excess_over_allowance = max(0, hh_benefit_income_taxable − hh_allowance)
• NC_marginal_rate = the highest NC marginal rate among adults in the household
• NC_on_benefits = excess_over_allowance × NC_marginal_rate

Quintile assignment. Each household is assigned to the quintile containing its primary adult's NC percentile (Q1 = P1–P20 through Q5 = P81–P100).

Illustrative aggregate results

The figures in this appendix are computed at the illustrative rate configuration used in the companion calculator workbook at the time of writing. The Base and Top rates that will finally apply under NC, and hence the specific NC-on-benefits revenue, are policy choices set out in the main report and are still subject to change. The methodology, allowance structure, distributional shape and relative proportions in the tables below are insensitive to the specific rate choice; only the absolute revenue figure scales with the rate schedule.

At the illustrative rate configuration (Base rate applied at P50, Top rate applied at P90, linear interpolation between them), with a £12,570 per-child allowance, 2025-26 operating basis and disability benefits exempt:

The excess-to-taxable-base ratio is approximately 59 per cent: of the taxable benefit base, roughly £100 billion sits above the child-based allowances. The blended marginal rate applied to that excess depends on where benefit-receiving households sit in the NC Total Income distribution and what rate schedule the policy adopts; at the illustrative rates used here the blended effective rate is in the region of 14 per cent on the taxable excess.

The distributional tables in the remainder of this appendix should likewise be read as illustrative. Their relative shape — which quintiles and household types carry the largest share of NC on benefits — is determined by the design of the mechanism (disability exempt, per-child allowance, primary adult's marginal rate) and by the distribution of benefit income across household types in the FRS. The specific £ bn figures in each cell scale with the rate schedule but the relative pattern is stable.

Distribution by household type

Pensioners are significant contributors in the distribution (£5 billion, 32 per cent of total). Almost every pensioner household pays some NC on benefits — the state pension for a single pensioner (approximately £11,500 per year) is close to the £12,570 single-person VNC, and any supplementary means-tested benefit pushes the household over the allowance threshold. State pension is treated as non-benefit income for NC purposes and falls within the main income-side calculation rather than on the benefits side, so the figures here reflect supplementary income (Pension Credit, Housing Benefit, Attendance-related NI) rather than state pension itself.

Working-age adults without children contribute £5 billion (32 per cent). This is the JSA/ESA/UC population at lower percentiles, where benefits-as-substitute-for-earnings are the primary source of household income and the lack of child allowance leaves them exposed to the full NC rate on excess benefit income above a small threshold.

Households with dependent children are substantially protected. Lone Parents pay £0.5 billion on 1.49 million households (12 per cent of lone-parent households paying an average per-paying-household of approximately £580 per year). Couples with children pay £1 billion on 5.40 million households (10 per cent paying, averaging £1,620 per paying household). The per-child allowance of £12,570 keeps the great majority of these households below the taxable threshold even at modest benefit income levels.

Multi-adult households contribute £3.9 billion. These are households where three or more adults are pooling housing but separately receiving benefits; the per-child allowance does less protective work because these households have relatively few children per adult.

Distribution by NC quintile

Q1 holds 40 per cent of the total excess by value because benefit income is concentrated in the lowest-income quintile, but contributes only 10 per cent of NC revenue because its marginal rate is low. Q2–Q5 each contribute between £2.85 and £3.23 billion — remarkably flat across the four upper quintiles, reflecting that the progressive marginal rate increases across quintiles offsets the declining benefit income base.

The concentration of revenue in the upper quintiles arises from the main-income-stacking logic: an adult whose total NC Total Income is in Q5 (so with substantial earnings, pension, or other income) who also receives modest benefit income pays the Top rate on their benefit excess. The benefit excess is small in absolute terms for these households, but the marginal rate is high. Conversely, a Q1 household receiving sizeable taxable benefit income with few or no children pays the low Q1 marginal rate on that excess.

Quintile × household type intersection

All values £ billion. The largest single cell is Q2 Pensioners (£1.89 billion) — single and couple pensioners with state pension plus small means-tested top-ups placing them in the second quintile with benefit income above the no-dependents threshold. Q4 and Q5 Multi-adult (£1.10 and £1.16 billion respectively) and Q4/Q5 WA No Children (£1.02 and £1.04 billion) are the next largest cells. Lone Parents contribute only £0.34 billion across all quintiles despite the relatively high taxable benefit income — the dependent-child allowance is doing its protective work.

This intersection table gives the grain needed for distributional analysis: for any combination of quintile and household type, the aggregate NC revenue from benefits is given directly.

Microdata file structure

The NC_on_Benefits_Households.csv file contains one row per surveyed household (16,754 records, weighted to 28.78 million UK households). Columns:

For per-quintile per-household-type attribution:

grouped = df.groupby(['quintile_label','household_type']).apply(
    lambda g: (g['NC_on_benefits'] * g['survey_weight']).sum() / 1e9
)

The receives_disability flag enables separate analysis of disability-receiving households versus the general population without re-running the microdata pass.

Limitations

• FRS benefits coverage and scope. The model's uprated benefit aggregate is £201.6 billion at 2025-26 prices. The comparable published figure — total UK social security spending minus state pension — is approximately £185–190 billion for 2025-26. The £12–16 billion difference has two offsetting components:

  • Child Benefit (approximately £12 billion per year) is captured in FRS benefit fields but is HMRC-administered and does not appear in DWP benefit expenditure tables. Including Child Benefit in the NC taxable base is consistent with the "tax all income" principle applied throughout this analysis.

  • Cost of Living Payments during 2022-23 (approximately £15 billion nationally) were one-off payments received by UC claimants, disability-benefit recipients, and pensioners during the model's base year. These amounts are captured in the FRS benefit fields for 2022-23 and flow through the 10.1 per cent uprating to 2025-26 even though the Cost of Living Payment programme has since been discontinued. This represents a structural over-statement of the 2025-26 base that will disappear when the model's base year is rolled forward.

  The net effect on NC on benefits is modest. Removing the uprated Cost of Living Payment component would reduce the headline figure by approximately £1–2 billion at the illustrative rates used here. Adding Child Benefit's contribution works in the opposite direction but is smaller because Child Benefit concentrates in household types whose dependent-child allowance already shelters most of it. A base-year transition to FRS 2024-25, published in March 2026, will remove the Cost of Living Payment artefact.

  Separately, DWP's Family Resources Survey Transformation research (2024) documents an average 37 per cent undercoverage of benefit caseload in raw FRS responses relative to administrative records, with the gap partially reduced by linking to DWP administrative data from 2024-25 onwards. The model here uses survey-only FRS 2022-23 and is therefore subject to the baseline undercoverage. If the true benefit base were scaled up to match DWP administrative totals, more households would exceed the per-child allowance threshold and NC on benefits would rise correspondingly — a sensitivity scalar of 1.34 applied to the taxable base yields an NC-on-benefits figure roughly 30 per cent higher than the headline. The upward pressure from undercoverage and the downward pressure from Cost of Living Payment inflation partly cancel, which is one reason the headline figure is reasonably robust to both corrections.

• Sub-component granularity. As discussed under "A note on granularity and implementation", the five FRS benefit components cluster entitlements of different characters. The disability premia within Universal Credit, Carer's Allowance, Industrial Injuries Benefit, and Maternity Allowance all have some claim to exemption under the extra-expense principle but cannot be separated in the FRS data used here. The net effect of finer granularity would be to reduce NC-on-benefits by an uncertain amount in the low single-digit billions. Implementation should resolve this at entitlement level using administrative data.

• Marginal rate choice. The primary adult's marginal rate is applied to the household's entire excess. An alternative apportionment by benefit-income share within the household would affect the total by approximately £0.3 billion.

• Household composition static. Household size and composition are taken as reported in FRS. Demographic shifts between base year and operating year would change the result at the margin.

• No behavioural response. The calculation assumes the NC regime does not change household structure, benefit claim behaviour, or any other decision margin. This is a static accounting exercise.

• Pensioner definition. The FRS hhcomps variable uses the DWP convention of classifying working pensioners by their employment status; a pensioner working part-time may be coded as WA No Children rather than Pensioners. This is consistent with DWP's own breakdown of household types but differs from a strict age-based definition.