Tax Planning · 2026/27
Employing Your Spouse: Legal Tax Saving or HMRC Red Flag?
Done correctly, putting your partner on the payroll saves a CIS subcontractor £1,200–£2,000+ every year. Done without the right paperwork, it can trigger a full HMRC enquiry with penalties reaching 100% of unpaid tax. Here is the line between the two.
This is one of the most talked-about tax strategies in the trades — and one of the most badly implemented. The concept is entirely legal and genuinely effective. The execution is where most subcontractors get into trouble. HMRC does not object to paying your spouse a salary. They object to paying a salary for work that was never done.
Why This Strategy Works — When It Works
The logic is straightforward. Your spouse likely has a Personal Allowance of £12,570 that is sitting unused — income that could be received completely tax-free. You, as the primary earner, may be paying 20% or 40% tax on every additional pound of profit. By paying your partner a legitimate salary for real work they do in the business, you shift income from a high-tax environment to a zero-tax one.
The saving is not trivial. A salary of £6,240 per year — ten hours per week at £12 per hour — reduces your taxable profit by £6,240. For a basic-rate taxpayer, that saves around £1,248. For someone in the higher-rate band, the saving exceeds £1,800 when National Insurance is factored in. Every year. Compounded over a decade, it is a meaningful number.
The reason HMRC tolerates this is because it is not a loophole — it is the correct application of tax law. Salaries paid to employees are a legitimate business expense, deductible from profit. Family members are not exempt from being employees. They just need to actually be employees.
HMRC's objection is never to the strategy itself. It is to the salary with no job behind it — the payslip without the hours, the "employee" who has never touched a spreadsheet.
CIS Tax Insights, 2026The Test HMRC Always Applies
Would you pay an unrelated person the same amount for the same work?
Every salary claimed as a business expense must be incurred "wholly and exclusively" for the purposes of the trade. For family employment, HMRC applies this test with extra scrutiny: if you would not hire an outsider at that rate to do those tasks, paying your spouse the same amount is not a business expense — it is a private payment dressed up as one. The deduction fails. The penalties begin.
Many subcontractors believe that any payment to a spouse is automatically suspicious to HMRC. It is not — provided the work is real and the pay is reasonable. The risk is not the strategy. The risk is the sloppy implementation. HMRC's starting point is scepticism, not prohibition. Your documentation is what converts scepticism into acceptance.
The Real Numbers: What You Actually Save
Below is a realistic calculation for a CIS subcontractor paying a spouse £6,240 per year — approximately ten hours per week at a market admin rate.
| Your Tax Position | Income Tax Saved | NI Saving (approx.) | Total Annual Saving |
|---|---|---|---|
| Basic Rate Taxpayer (20%) | £1,248 | £0–£374 | £1,248–£1,622 |
| Higher Rate Taxpayer (40%) | £2,496 | £0–£374 | £2,496–£2,870 |
| 10-Year Cumulative (basic rate) | £12,480 | — | £12,480–£16,220 |
These figures assume your spouse has no other income and their Personal Allowance is fully available. If they have other employment income, the calculation changes — and the tax saving reduces proportionally. This is one of the reasons you need an accountant to model the specific numbers for your household, not a generic estimate.
What Work Qualifies — And What Doesn't
The most common question is: what can my spouse actually do that HMRC will accept? The answer is broader than most people expect — but it must be genuine, documented work that the business actually needs.
Bookkeeping: logging receipts, reconciling bank statements, categorising expenses
CIS admin: tracking deduction statements, chasing Payment and Deduction Statements from contractors
Invoicing: raising, sending, and chasing invoices on behalf of the business
Supplier management: ordering materials, comparing quotes, managing supplier accounts
Diary and scheduling: booking jobs, managing site visits, coordinating with contractors
PAYE/payroll admin if you employ workers of your own
Vague descriptions: "general support" or "helping with the business" with no specific tasks
Work your spouse claims to do but has no record of — no emails sent, no spreadsheets updated, no transactions logged
Domestic tasks reframed as business work — cooking for site workers, cleaning the van that is also the family car
A salary that bears no relation to hours worked or market rates — paying £20,000 for ten hours a month of basic admin
Any arrangement where the salary is paid back to you in cash or used for joint household expenses with no separation
Employment of a spouse who is already a higher-rate taxpayer and derives no meaningful tax benefit from the arrangement
What Happens When HMRC Investigates
A sham spouse employment arrangement is not just a deduction that gets disallowed. It is treated as a deliberate attempt to reduce tax — and HMRC's penalty regime for deliberate behaviour is severe.
Penalties are calculated as a percentage of the unpaid tax — not of the salary. Six years of disallowed deductions, plus interest, plus the penalty percentage, can produce a bill that significantly exceeds the original tax "saving." This is why the implementation matters as much as the concept.
The Non-Negotiable Compliance Checklist
If you want this arrangement to survive HMRC scrutiny — whether in a routine review or a targeted enquiry — every item on this list must be in place before the first payment is made.
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Written Employment Contract — Before the First Payment A formal, signed contract specifying the role title, duties (be specific: "bookkeeping, invoicing, CIS statement management"), hours per week, and hourly or annual rate. This document is your first line of defence. If HMRC asks for it and you cannot produce one, the arrangement is immediately suspect.
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Weekly Timesheets or Work Log A simple record of hours worked and tasks completed each week. It does not need to be elaborate — a shared spreadsheet with date, task, and time spent is sufficient. The key is consistency: a log that starts the week after an HMRC letter arrives is not convincing. It needs to pre-date any enquiry by years.
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Market-Rate Salary — Check Local Job Adverts Pay what you would pay a stranger. Search for bookkeeper or admin assistant roles in your area and note the going rate. Pay your spouse within that range for the hours they work. Keep a screenshot of the comparable rates at the time you set the salary — this is the evidence HMRC will want if they question whether the rate is commercial.
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Bank Transfer from Business Account to Spouse's Personal Account Every salary payment must leave your business bank account and arrive in your spouse's personal account. Cash payments are unacceptable. Joint accounts are problematic. The transaction must be clearly traceable on both sides. This is the proof that money actually changed hands in a genuine employment relationship.
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Register as an Employer with HMRC If your spouse's salary exceeds the Lower Earnings Limit (£6,396 in 2026/27), you must register as an employer and operate PAYE. This is not optional. Issue payslips, submit RTI (Real Time Information) reports to HMRC on or before each pay date, and issue a P60 at year end. Use HMRC's Basic PAYE Tools if you do not have payroll software — it is free.
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Keep All Records for at Least 6 Years Contracts, timesheets, payslips, P60s, bank statements showing each transfer — retain everything for a minimum of six years. HMRC's look-back period for non-deliberate errors is four years; for deliberate behaviour it is six. You need to be able to evidence every payment made in the arrangement at any point during that window.
The Four Patterns That Trigger HMRC Scrutiny
Paying precisely £12,570 per year — the exact threshold — with no other justification is a pattern HMRC recognises immediately. If the rate genuinely works out to that figure, fine. But engineering a salary to land exactly on the allowance without the hours to support it is a flag.
A spouse salary that jumps significantly in years where your own income rises sharply — and drops back when it falls — looks like income splitting rather than genuine employment. Salary changes should be driven by role changes or market rates, not by your tax bracket.
In 2026, legitimate admin work leaves traces — emails sent, spreadsheets edited, bank reconciliations completed. If HMRC asks your spouse to demonstrate the work they do and there is no digital evidence of any of it, the arrangement becomes very difficult to defend.
If the "salary" is transferred to a joint account that you both use for household expenses, HMRC may argue that no genuine employment payment was made. The funds need to be clearly separated — your business pays your spouse's personal account, which they control independently.
Should You Do This? A Simple Decision Framework
- Your spouse genuinely does regular, documented admin work for the business
- They have unused Personal Allowance (no or low other income)
- You are willing to set up a proper PAYE structure and maintain records
- The salary is set at a market rate for the actual hours and tasks involved
- You have or will get an accountant to model the tax saving and structure the payroll correctly
- Your spouse has no real involvement in the business and would not be able to describe what they do if asked
- They are already a higher-rate taxpayer — the tax benefit disappears entirely
- You are not prepared to run PAYE properly or keep records for six years
- The arrangement is purely about reducing tax with no genuine work behind it
- You cannot answer "what would this person do in a typical week?" with specifics
The One Question That Decides Everything
Before setting up spouse employment, ask yourself one question: if HMRC wrote to your spouse today and asked them to describe their role, the tasks they perform, the hours they work, and provide examples of their output — could they do it confidently and accurately?
If the answer is yes, and the documentation is in place to back it up, you have a legitimate, defensible, and genuinely valuable tax strategy. If the answer is no — or "probably not" — the risk significantly outweighs the saving.
The strategy is not complicated. The compliance is not burdensome. A written contract, a timesheet, a payroll registration, and bank transfers from the right account. Four things that take an afternoon to set up and protect a saving worth £1,200–£2,000 every year for as long as the arrangement runs.
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This article is for informational purposes only and does not constitute professional tax, payroll, or employment advice. Always consult a qualified accountant before implementing any spouse employment arrangement. PAYE thresholds and tax rates based on 2026/27 HMRC guidance.