A tax set-aside envelope for the self-employed
Employment hides a step: the tax comes out before the money reaches you. Self-employment removes that step and nothing replaces it, so every invoice arrives looking larger than it is. The fix is structural rather than motivational — a separate envelope that takes its share the day money lands, sized from your own last filing rather than a rule of thumb, and never treated as available balance. This page covers how to size it, when to move the money, and what to do in a first year with nothing to base it on.
The problem is that the money arrives whole
On a payslip, tax and social contributions are deducted before the number you see, so the amount in the account is genuinely yours to allocate. Invoice income has no such step. The client pays the full amount, it lands in the same account as everything else, and from that moment it looks like available money — because it is, right up until it is not. Nothing about this is a discipline problem. The employed version of you was never disciplined either; a payroll system was doing the work. Going self-employed means rebuilding that system by hand, and the smallest version of it that works is one envelope that takes its cut on the way in rather than a resolution to keep enough back.
Get the rate from your own filing, not from a rule of thumb
You will see figures quoted — set aside a quarter, set aside a third — and they are not advice so much as somebody else's arithmetic. The correct share depends on your country, your legal form, whether social contributions are separate from income tax, what deductions your work generates, and how much you earned in total, which is not knowable from any single invoice. Take the number from a document instead. If you have filed before, take last year's total tax and contributions and divide by last year's total revenue: that percentage is a far better estimate for this year than any published rule. If your accountant gives you a figure, use theirs. Write the percentage down somewhere in the budget so the decision is made once rather than every time an invoice clears.
Move the money the day the invoice is paid
Every time an invoice is paid, immediately move that percentage into a separate account and record it as a fill into the tax envelope. Not weekly, not at month end. The delay is where it goes wrong: money that spends a fortnight in the main account has already been mentally counted twice, once as revenue and once as budget. Keeping it in a different account matters more here than for any other envelope, because a tax liability is the one obligation you cannot renegotiate, defer by a month, or partially pay without consequence. The rest of the budget then operates on what is left, which is the number that was actually yours the whole time.
The first year, when there is nothing to divide
With no previous filing, you have no percentage, and this is exactly when the money is tightest and the temptation to postpone is strongest. Do two things. Set the envelope higher than you think it needs to be rather than lower — an over-funded tax envelope produces a pleasant surplus, an under-funded one produces a bill you cannot pay — and get the figure confirmed by someone who knows your jurisdiction as early in the year as you can afford to, rather than in the month the return is due. If professional advice is genuinely out of reach at the start, use the tax authority's own published guidance for your situation and revise the moment you have real numbers. What you should not do is wait for certainty before setting anything aside; a rough set-aside started in month one beats an exact one started in month ten.
What the envelope is not for
It is not an emergency fund, not a buffer for a slow quarter, and not a cushion you dip into with the intention of putting it back. The reason is not moral, it is arithmetic: the liability keeps growing whether the envelope does or not, so borrowing from it means owing the same amount with less time to find it. If a slow month means you genuinely cannot cover living costs without touching it, treat that as the emergency it is and record the amount taken as a debt to the envelope, with a plan for the specific invoices that will repay it. And keep the tax envelope separate from the annual business costs — software, insurance, accountancy fees — which are also lumpy and also certain, but which you can actually reschedule if you have to.
Common questions
Should the tax money sit in a different bank account or just a different envelope?
A different account, if your bank makes that easy. Envelopes are a way of deciding what money is for; a separate account is a way of making the wrong decision inconvenient. For most envelopes the deciding is enough. Tax is the exception, because the consequence of getting it wrong is not an awkward month but a debt to an authority with its own timetable and penalties. If a second account is not practical, at least keep the envelope visible somewhere you look often, and check it against your revenue total once a month rather than once a quarter.
My income varies wildly. Does a percentage still work?
A percentage handles variable income better than a fixed monthly amount, which is the main reason to use one. A big invoice sets aside proportionally more and a lean month sets aside proportionally less, without you deciding anything. The part it does not handle is a progressive system, where a very good year pushes you into a higher band and last year's percentage turns out low. Watch your running annual revenue against last year's, and if you are clearly ahead, raise the percentage part-way through the year rather than discovering the gap at filing time.
What if I have already spent money I should have set aside?
Work out the shortfall in one sitting rather than in instalments of dread — total revenue so far, times your percentage, minus what is in the envelope. That number is the problem, and it is usually smaller than the version you have been imagining. Then raise the set-aside percentage on incoming invoices until the gap closes, rather than trying to find the whole sum at once. If the deadline arrives before the gap closes, the tax authority is generally more willing to arrange payment with someone who contacts them early than with someone who goes quiet, and that conversation is easier when you can state the exact figure.
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