Download the app
Planning retirement as a couple: why two pensions are not one plan
A couple has two personal allowances, two State Pensions on two different dates, and usually one spending target. Planning each person separately wastes allowances and misses the gap years; planning the household as one pot ignores tax and who owns what. The answer is a shared plan with two people in it.
Figures for the 2026/27 tax year · Published 2 October 2026
Most retirement calculators are built for one person. Most retirements are lived by two. The result is that couples either run two separate plans that don’t add up, or one plan that treats everything as a single pot and gets the tax wrong. Here is what changes when there are two of you.
1. You retire on different dates
If one of you is three years older, your State Pensions start three years apart and your final salary pensions may too. The household can have a period where one person is working, one is retired, and the retired one has no State Pension yet. Those are the years that need the most careful planning, and they are invisible if you plan the household as one block that retires on one date.
2. Tax is personal; spending is shared
Each of you has a £12,570 personal allowance and a £37,700 basic-rate band. A household needing £50,000 a year after tax from taxable income pays about £6,200 in tax if it is drawn evenly between you, and about £12,400 if it all comes from one person. That difference, every year for thirty years, is worth more than most people’s investment decisions.
It also means the pension that gets built up matters. If one of you earns much more, paying some of that into the other’s pension (anyone can have £2,880 a year paid in and get it topped up to £3,600, even with no earnings; more if they earn) builds a second pot to draw inside a second allowance later.
3. Who owns what matters
A pension belongs to one person. An ISA belongs to one person. A joint account belongs to both. When planning, keep each asset with its owner, because that decides whose tax it falls under and what happens to it on death. Isaac does exactly this: each pension, ISA and property has an owner, and the income chart shows each person’s share.
Isaac models two people in one plan: two allowances, two State Pension ages, each pension with its owner, and one shared spending target. Link accounts and you both see the same plan, with edits synced between you.
Plan as a couple in Isaac →4. Plan for one of you dying first
Nobody enjoys this part, but it is where couples’ plans most often fail. On the first death:
- The State Pension stops; under the new State Pension little or nothing passes to the survivor.
- A final salary pension usually continues to the spouse at a reduced rate, often half or two-thirds. Check your scheme’s figure.
- Pension pots and ISAs can pass to the survivor; a spouse inherits an additional ISA allowance equal to the value of the deceased’s ISA, so it stays tax-free.
- Household spending falls, but not by half. Council tax gets a 25% discount; most other bills carry on.
- Two personal allowances become one, so the survivor’s tax rate on the same income rises.
The test is simple: take the plan, remove one person’s State Pension and part of their final salary pension, keep most of the spending, and see if the survivor is fine. If not, the fix is usually life cover in the early years, or making sure the pots are built up in both names.
5. Agree the spending target together
The number that drives everything is what you want to spend each month, together. Most couples have never said it out loud. Do it before you model anything, and include the things you want to spend more on early (travel, helping children) and the things that will fall away later (commuting, the mortgage). A spending curve that starts higher and tapers is both more realistic and less expensive than a flat line.
6. Unmarried couples: the rules are different
Marriage and civil partnership carry a spouse exemption from inheritance tax, the ability to inherit ISA allowances, and often better scheme death benefits. Unmarried partners get none of that automatically. If you are a long-term unmarried couple with meaningful pensions and a shared home, nominate each other on every pension, make wills, and model the first death with no spouse exemption. It is sobering, and worth knowing early.
The short version
Two people, two allowances, two dates, one spending target, one plan. Build both pensions, draw both allowances, model the gap years, and run the survivor case. Then you can stop worrying about it, which is the point.
