Corporation Tax Payment Planning for UK Companies

A corporation tax bill rarely causes trouble because of one bad month. More often, it is the result of months of takings being spent, invoices being paid late, or the tax position being left until the accounts are ready. Sensible corporation tax payment planning gives limited company directors a clear view of what is likely to be due, when it must be paid, and how to keep that money available without starving the business of working cash.

For a tradesperson running a limited company, a contractor with uneven project income, or a landlord with repair costs and rent cycles to manage, that clarity matters. Tax is not just an annual formality. It is a business cost that needs to be planned alongside wages, materials, fuel, VAT, finance payments and suppliers.

Know the corporation tax deadline before planning the cash

For most UK limited companies, corporation tax is due nine months and one day after the end of the accounting period. If your company year end is 31 March, payment is normally due by 1 January of the following year. The Company Tax Return is generally due later, within 12 months of the accounting period end.

That gap catches people out. You may not have filed the return yet, but HMRC can still expect payment. Waiting until the accounts have been finalised before thinking about the bill can leave you trying to find a sizeable sum during a quieter period.

The rate of corporation tax depends on your company’s taxable profits and circumstances. Companies with profits up to the small profits threshold may pay the small profits rate, while companies with higher profits may pay the main rate or receive marginal relief between the thresholds. Associated companies can affect those thresholds, so this is not always as simple as looking at one company’s profit figure in isolation.

The practical point is straightforward: do not base your tax pot on a rough percentage of sales. Corporation tax is charged on taxable profit, not money received into the bank account. A busy year can produce lower taxable profit after legitimate business costs, while a company with low overheads may face a higher bill than expected.

Build a corporation tax payment plan from current figures

A useful plan starts with up-to-date bookkeeping. If the bank account, invoices, supplier costs, payroll and director transactions are several months behind, any tax estimate is little more than a guess.

Monthly bookkeeping gives you a running view of profit and allows your accountant to estimate corporation tax well before the deadline. The estimate will change as the year develops, but it is far easier to adjust a monthly saving than to deal with an unexpected bill at the end.

Many small companies benefit from moving an agreed amount into a separate business savings account each month. This is not a formal HMRC arrangement, but it stops tax money blending into everyday spending. If the company has a strong month, the amount can be reviewed. If a customer pays late or a job is delayed, you can see the pressure early rather than discovering it once payment is due.

It also helps to keep three pots in mind: VAT, payroll-related liabilities and corporation tax. They are all money the business may hold temporarily, but they are not all available to spend. Treating them as working capital is one of the quickest ways for a profitable company to become short of cash.

Forecast from profit, not just the bank balance

A healthy bank balance does not automatically mean corporation tax is covered. The balance may include VAT collected from customers, deposits for work still to be completed, funds needed for payroll, or money owed to suppliers.

Likewise, a tight bank balance does not always mean the tax bill will be low. A company may have earned good profits but used the cash to buy equipment, repay borrowing or cover slow-paying customers. Some of those payments affect cash flow differently from taxable profit.

A simple rolling forecast should look at expected sales, direct job costs, regular overheads, payroll, VAT dates, loan repayments and the estimated corporation tax provision. For businesses with seasonal work, such as construction firms or companies serving the transport trade, the forecast should cover the quieter months as well as the busy ones.

Use legitimate reliefs before the year end

Good tax planning is not about buying things you do not need just to reduce a bill. Spending £1 to save a fraction of that amount in tax is still spending £1. The better question is whether the company already needs to make an investment, settle a cost, or reward staff in a way that also has a sensible tax outcome.

Capital allowances can be relevant where the business needs qualifying equipment, tools, machinery or certain commercial vehicles. The timing of a purchase can affect when tax relief is available, but the asset must be genuinely required for the business and the rules differ by asset type. Cars, for example, need particular care because the tax treatment can depend on emissions and whether the vehicle is available for private use.

Employer pension contributions are another area worth considering. A properly structured employer contribution can be tax-efficient and support longer-term financial planning, but it must be affordable and the timing should be checked. It is not a last-minute fix if the company has insufficient cash to pay it.

Reviewing allowable expenses is equally worthwhile. Trade-specific costs may be missed where records are incomplete: software, accountancy fees, professional subscriptions, insurance, advertising, use of a business phone, protective clothing where appropriate, and travel wholly for business purposes are common examples. The facts matter. Ordinary clothing, private journeys and personal spending are not made allowable simply because they were paid from the company account.

Watch drawings and director loan accounts

For owner-managed businesses, the way money is taken from the company has a major effect on cash flow and tax planning. Salary, dividends, expenses, pension contributions and director’s loan withdrawals each have different accounting and tax consequences.

A director’s loan account should be reviewed regularly, particularly where personal costs have been paid by the company or cash has been withdrawn without being clearly recorded as salary or dividends. If a loan is not repaid within the relevant period, the company can face an additional tax charge. There may also be personal tax consequences where a loan exceeds the applicable threshold or is written off.

This is not an area to tidy up at the last minute. Dividends must be supported by distributable profits, and paperwork should match what has actually happened. Taking more from the business than it can afford may create pressure on corporation tax, VAT and supplier payments later.

Plan earlier if your company is large or growing quickly

Most small companies pay corporation tax in one amount by the normal deadline. However, large companies may have to pay by instalments, often before the accounting period ends. The rules are based on profit limits and can be affected by the number of associated companies.

This may seem distant for a small business, but rapid growth can change the position faster than expected. A company taking on several larger contracts, completing a property transaction, or having a particularly profitable year should check whether instalment rules are becoming relevant. Waiting for the final accounts is too late if earlier payments were required.

Growth also increases the value of management information. Once turnover and staffing rise, quarterly or monthly reviews can give directors better control over tax, VAT, payroll and future investment decisions.

If payment will be difficult, act before the deadline

There are occasions when the company genuinely cannot pay the corporation tax bill on time. A major customer may have failed, work may have stopped unexpectedly, or cash may be tied up in a dispute. Ignoring HMRC does not make the issue easier. Interest can accrue on late payment, and enforcement action becomes more likely where there has been no contact.

Where there is a genuine short-term cash flow problem, it may be possible to discuss a Time to Pay arrangement with HMRC. This is not automatic, and HMRC will expect a realistic proposal based on what the company can afford. The stronger your records and forecast, the more credible that conversation will be.

Do not use a payment arrangement as routine tax planning. If the business can pay on time, it should. But when circumstances change, speaking up early is usually far better than waiting for reminders or penalties.

Make tax provision part of the monthly routine

The most effective corporation tax payment planning is often the least dramatic. Keep the books current, review profit regularly, set aside money as the liability builds and check major decisions before committing to them. That gives you time to make choices rather than react to a deadline.

At Short And Sons Accountants, we see how much easier this is when directors have figures they can trust and someone to explain what they mean in plain English. A short review before the year end can turn a future tax bill from a worry into a planned business payment.