Non-working spouse returning to work: what to re-check

Joint assessment often matters most when one spouse has low income. As the second income grows, there can be less unused band to transfer, so the difference between joint and separate can narrow.

Test a few second-income values (for example €0, €10k, €20k, €30k) while keeping the main income fixed. This shows whether the “best option” is stable across the range you expect.

If the second earner starts a pension, the relative benefit can depend on each person’s marginal rate and how much of the 20% band remains. Scenario testing with small pension changes is often more informative than a single estimate.