Provisional tax: the three dates that cause the most damage

Provisional tax asks you to estimate a result before the year is finished, and then penalises you for estimating it badly. That is an uncomfortable design, and it catches profitable businesses just as often as struggling ones.

Why the first estimate is the one that hurts

A first submission is often copied from last year because the year is only half done and nobody wants to guess. If trading has improved materially since then, the underestimate is locked in early and the shortfall compounds through the rest of the year.

The fix is unglamorous: prepare the estimate off actual management figures for the period, not off the prior year, and write down the assumptions you used. If the assumptions change, the estimate can be revisited with a reason.

Treat the second submission as a correction, not a repeat

By the second submission you usually have most of the year visible. This is the point to correct an optimistic or pessimistic first estimate, because after year-end the options narrow to paying the difference and arguing about penalties.

A short checklist

• Base each estimate on current management accounts, not the prior assessment
• Record the assumptions behind the figure
• Revisit the estimate whenever trading shifts materially
• Diarise all three dates at the start of the year, not the month before

None of this is complicated. It is simply work that has to happen on a date, which is exactly the kind of work that slips when the person responsible also runs the business.

If any of the above describes your position, the first consultation is free and there is no obligation attached to it.