The Tax Bill You Did Not Set Money Aside For

The message arrives on a Tuesday. You open it, read the number twice, and then do the sum you already know the answer to: the money is not there. Not because the year went badly. The year went fine. It is just that the money came in months ago and went out again on materials, on the van, on the mortgage, on a quiet August.

Almost nobody is caught out by tax because they do not know it exists. They are caught out because tax is charged on profit, arrives long after the work, and sits in the same account as everything else until the day it is needed.

Sagar, who has run a digital agency since 2000, had exactly that year in 2012. The business did well, and the profit went straight back into it: new laptops, new hires, a power backup, better internet and an office renovation. None of those was a bad decision. But by the time the tax bill arrived, the profit it was worked out on had already been spent.

This guide is about the habit that fixes it, what to do if the bill is already on the table, and the one number worth writing on the wall. It is not tax advice: what you owe depends on where you are and how you are set up, and your accountant is the person for that.

Is this you?

• The bill arrives and you have to find the money rather than move it.
• You set money aside in good months and spend it in slow ones.
• Business money and household money share one account.
• You judge the year by the bank balance rather than by what you have earned.
• You have thought "I will sort that out nearer the time" more than once.
• You know roughly what you invoiced last year and not what you made.

Two or more, and the problem is not the tax. It is that the money was never separated from the rest, and by the time you needed it, it had already done something else.

Why it catches out people who are doing fine

Tax follows profit, and most people set aside against income. These are different numbers and they move differently. A month where you invoiced a lot and spent a lot on materials owes less than it looks. A quiet month with low costs owes more of what came in than you would guess. Setting aside a flat share of everything you invoice either starves the business or leaves you short, and usually it alternates.

The money arrives long before the bill does. By the time it is due, that money has been in your account for months. Money in an account gets spent, not through recklessness but because it looked like yours. It never felt like the tax office's money because it was never anywhere else.

Nothing tells you where you stand until it is too late to act. If your costs are not written down, your profit is an estimate, and you cannot know what is coming until someone works it out. By then it is not a plan, it is a deadline.

What it costs if nothing changes

Only about 1 in 5 invoicing businesses (25 of 112) records any expenses alongside its invoices.

That is the root of it. Without costs written down, profit is a guess, and anything set aside against a guess is a guess as well. The businesses that get caught are rarely the ones earning least. They are the ones who could not see the number coming.

The cost of that is not only the scramble. It is what the scramble makes you do: take work you would have turned down, pay on a credit card, delay something that mattered, or borrow at a rate you would never accept on a calm day. The bill is survivable. The decisions made in a hurry around it are what do the lasting damage.

What to do this week, with what you already have

None of this needs software or an appointment. It is an afternoon.

1. Open a separate account

Not a pot in your head or a mental note. A different account, at any bank, that you do not carry a card for. This one step does more than the other four together, because the reason the money is missing is almost always that it was never anywhere else.

2. Work out your share, once

Ask your accountant what share of profit you should expect to owe. Then turn it into a share of income, because income is what actually arrives and what you can act on. If you owe roughly a quarter of profit and your costs take a bit over a third of what you invoice, the share to move is nearer a sixth of each payment than a quarter. Getting that conversion wrong in either direction is the most common mistake here.

3. Move it the day the payment lands

Not at month end, not on payday. The day the money arrives, move the share. A standing order on a fixed date does not work when your income is uneven, because the transfer happens whether the money came in or not. A percentage moved on arrival scales itself: big month, bigger transfer, quiet month, smaller one, and nothing to remember.

4. Write down your costs

Every cost you do not record is profit you appear to have made and tax you appear to owe. A photo of the receipt on the day you pay it is enough to start. This is the step everyone skips and the one that makes the other four honest.

5. Leave it alone

The tax pot is not a cash flow buffer. Borrowing from it to cover a slow month does not solve the slow month, it moves it to a worse date and adds a deadline. If you find yourself needing to raid it regularly, the problem is cash timing rather than tax, and that is a different fix.

If the bill is already here and the money is not

First, the practical order, because there is one and it matters.

1. Work out the real gap. What is due, what you have, what is realistically coming in before the deadline. The number is usually less frightening written down than carried around.
2. Talk to your accountant this week, not next month. Asking before a deadline generally leaves more options open than asking after it, and in many places a payment arrangement is possible if you approach it early.
3. Chase what you are owed. Unpaid invoices are the cheapest money available to you. Going through them properly before borrowing anything is worth an evening.
4. Be careful about expensive credit. A short-term facility taken in a panic can cost more over a year than the interest on a late payment arrangement. Compare them properly rather than taking the fastest option.
5. Start the habit anyway. Even mid-crisis, moving the right share of new payments into a separate account from today shrinks the next bill while you deal with this one.

And one thing worth saying plainly: being behind on this is common, it is not a character failing, and it is not evidence that the business is not working. It is the predictable result of a system where the money and the bill arrive months apart. Fixing the system is a better use of the week than feeling bad about it.

How to stop it happening again

The whole thing comes down to two habits: know your profit as the year goes along, and move a share of every payment somewhere you cannot casually spend it.

The first needs your costs recorded against your invoices so the number is real rather than remembered. That is what invoicing software is for, and it is the part Billbooks does: the invoices and the expenses in one place, so what you have actually earned is a figure you can look at rather than reconstruct in February. If you would rather keep a spreadsheet, that works too, as long as the costs go in it.

The second needs nothing but a second account and a rule you follow on the day money lands. No tool required.

Three free tools for the money side of this

If the pot keeps getting raided rather than growing, the cause is usually cash timing rather than tax: the cash gap check shows when your money actually arrives against when your bills fall due. And if costs are the part you never get round to, what an expense tracker actually needs to do is the shorter version of step four.