Income Splitting for Married Couples UK: How to Reduce Your Tax Bill (2026/27)

One of the most straightforward ways for married couples and civil partners to reduce their combined tax bill is income splitting — legally restructuring who receives what income so that more of it falls in a lower tax bracket. HMRC permits a range of arrangements provided they reflect genuine economic ownership.

This guide covers the four main methods, the rules for each, and the planning traps to avoid.

This is not tax advice. Income splitting arrangements can be complex. Discuss any significant restructuring with a qualified tax adviser.

Why Income Splitting Matters

The UK income tax system taxes individuals, not households. If Partner A earns £80,000 and Partner B earns £12,000, a large chunk of Partner A’s income is taxed at 40%. If some of that income could legitimately be directed to Partner B, it would be taxed at 20% or not at all.

Marginal rate difference: The gap between paying 40% and paying 20% (or 0%) on the same pound of income is 20–40 percentage points. On £10,000 of additional income, that is £2,000–£4,000 per year.

Method 1: Marriage Allowance

Best for: Couples where one partner earns below £12,570 and the other is a basic-rate taxpayer.

The Marriage Allowance allows the lower-earning partner to transfer up to £1,260 of their unused Personal Allowance to the higher earner.

It does NOT apply if the higher earner pays 40% tax. The Marriage Allowance is a modest relief — useful but not transformative.

You apply online at GOV.UK. You can backdate claims up to 4 years.

Method 2: Transferring Rental Property Income (Form 17)

Best for: Couples who jointly own investment property and one pays a higher tax rate.

By default, HMRC taxes rental income from jointly-held property 50:50 between married couples, regardless of who actually does the work or contributed more to the purchase.

However, if the beneficial ownership is genuinely unequal — for example, if Partner B owns 90% and Partner A owns 10% — you can declare this to HMRC using Form 17 supported by a Declaration of Trust (deed).

How It Works

1. Prepare a Declaration of Trust with a solicitor or conveyancer, reflecting the actual beneficial ownership (e.g., 90% to the lower earner)
2. Submit Form 17 to HMRC within 60 days of the declaration
3. HMRC will then tax rental profits in line with the beneficial interest split

The 50:50 Default Rule

HMRC applies 50:50 splitting automatically unless you complete Form 17. Without the form, even if you transferred 90% of the beneficial interest to your spouse, HMRC will still tax you 50:50.

Planning Consideration

Transferring beneficial interest to a spouse is exempt from CGT (no CGT on spouse transfers). It does not trigger Stamp Duty if no money changes hands. However, the shares must reflect genuine ownership — a nominal transfer just for tax purposes may not survive HMRC scrutiny.

Method 3: Dividend Income Splitting via Company Shares

Best for: Company directors with limited companies who want to extract income through their spouse.

If you own a limited company, you can transfer shares to your spouse. When dividends are paid on those shares, they are taxed as your spouse’s income — potentially at a lower rate or within their Dividend Allowance (£500 in 2026/27).

Tax Saving Example

Assumes spouse has no other income above basic rate. Figures use 2026/27 dividend tax rates.

Rules and Risks

• The CGT transfer exemption between spouses applies — no immediate CGT on the share transfer
• Shares must be genuine (full voting and economic rights, not just dividend rights)
• HMRC’s Arctic Systems case (2007) established that ordinary share transfers to a spouse are generally acceptable
• HMRC’s settlements legislation (ITTOIA s.620) may apply if the arrangement has no commercial purpose beyond tax avoidance — e.g., issuing a special “dividend-only” class of share solely to the spouse with no real ownership
• Using alphabet shares (A, B, C shares where flexible dividends can be directed to specific shareholders) is more complex and requires careful legal structuring

Method 4: Employing Your Spouse

Best for: Self-employed individuals or company directors whose spouse does genuine work in the business.

You can pay your spouse a salary for work they genuinely do in the business. The salary is a deductible expense, reducing your taxable profit, while the spouse pays tax at their own (lower) marginal rate.

Rules

• The salary must be at a commercial rate for the work actually done — HMRC will challenge inflated salaries for minimal work
• The work must be genuine — no salary for doing nothing
• The amount should reflect what you would pay an arms-length third party
• As an employer, you will have payroll obligations (PAYE, NI contributions if above the Secondary Threshold)
• Employment Allowance (£5,000 in 2026/27) may offset employer NI

Example

James is a sole trader earning £90,000. His wife Sarah does the bookkeeping and client admin, working 15 hours per week. He pays her £18,000 per year — a reasonable rate for 15 hours/week.

• James’s taxable profit reduced by £18,000 — saving 40% = £7,200 income tax + saving on NI
• Sarah pays 20% on her income above the Personal Allowance — but has her own £12,570 limit

What HMRC Will Challenge

HMRC takes a closer interest in family income splitting if:

1. The arrangement has no commercial substance — the income recipient does no real work and holds no genuine economic interest
2. Shares are issued with no rights except dividends (specifically designed to divert income)
3. The payment level is disproportionate to the contribution
4. There is a pattern of the higher earner receiving the income and then gifting it to the spouse

The key principle: the arrangement must reflect genuine economic ownership or contribution. Tax savings that flow naturally from that arrangement are legitimate. Artificial structures designed purely to shift income without real ownership or service are not.

Summary: Which Method to Use?

Related Guides

• Director Salary and Dividend Mix 2026/27
• Dividend Tax Guide
• Sole Trader vs Limited Company Tax
• Rental Property Tax Guide
• Capital Gains Tax on Property
• Marriage Allowance: Who Qualifies and How to Claim