IR35 is often treated as a compliance hurdle to clear once a year, then filed away. For contractors working through a personal service company (PSC), that approach tends to leave gaps. The off-payroll rules determine how income from a particular engagement is taxed — but what happens next, in your company's accounts, in your payroll, in your Corporation Tax calculation and in your Self Assessment return, follows directly from that treatment.

The result is that joined-up IR35, payroll and dividend advice is less a luxury and more a practical requirement, particularly where you move between engagements with different IR35 outcomes, or where you are taking salary and dividends alongside income already taxed under the off-payroll rules. This post sets out why the individual taxes are connected, what each piece involves, and the questions worth asking before you choose an accountant to help.

The off-payroll working rules are designed so that, where they apply, contractors working through intermediaries broadly pay the same Income Tax and National Insurance as employees. That does not make you an employee for legal or employment purposes. It does mean that the income from that engagement has to be understood before it can be correctly recorded in your company's accounts or withdrawn from it.

IR35 status affects how contract income is treated for employment tax purposes, which makes it directly relevant to everything that follows: your company's accounting records, its Corporation Tax position, what can lawfully be distributed as a dividend, and how your personal Self Assessment return looks at year-end.

Treating IR35 as a once-a-year box-ticking exercise can therefore leave important gaps. The status of each engagement also needs to be reconsidered if terms and conditions change — HMRC's guidance confirms as much. Where you work on several contracts at once, or move between engagements during the year, your records need to reflect the different treatment that applies to each one.

From an accounting perspective, that means it is not simply a question of whether your accounts can be filed correctly at the end of the year. You need to understand how your contract income has been taxed, what your company has earned, what has already passed through PAYE and what can properly be taken as salary or dividends. Those are connected questions, and they are easier to answer when the records have been kept with that connection in mind.

IR35 status needs to be considered for each engagement individually. One permanent status does not attach to you or your company. You might complete one engagement for a medium-sized business that is assessed as inside IR35 while carrying out a separate engagement that falls outside the rules. Clear records showing where different income streams came from, and how they were treated, are therefore a practical necessity.

Who carries responsibility for the determination

Where you supply services through a PSC to a public-sector organisation, or to a medium or large private or voluntary-sector client, the client is generally responsible for deciding your employment status for tax. In that situation, you should normally receive a Status Determination Statement setting out the conclusion and the reasons for it, and there is a process for challenging a determination you disagree with.

Where your end client qualifies as small and sits in the private or voluntary sector, your PSC generally remains responsible for assessing employment status. If the engagement falls within the rules, the intermediary may need to calculate a deemed employment payment and account for the relevant Income Tax and National Insurance — and that position also needs to be reflected appropriately in payroll, Corporation Tax and Self Assessment reporting.

You can refer to HMRC's off-payroll working guidance when considering how the rules operate, while recognising that the facts and working practices of your individual engagement still matter. This is another reason to identify IR35 issues while an engagement is running rather than reconstructing everything at year-end.

Where the Chapter 10 off-payroll rules apply and a public-sector or medium or large private-sector client is the deemed employer, that organisation generally calculates the deemed direct payment and accounts for Income Tax and employee National Insurance. Employer National Insurance is a cost for the deemed employer rather than an amount deducted from your deemed earnings. Your PSC therefore receives the relevant payment after employment taxes have already been dealt with.

That matters because you cannot treat that amount as though it were ordinary outside-IR35 trading income without considering the specific accounting and double-taxation rules that apply. Legislation contains provisions intended to prevent the same income being taxed twice. Amounts representing income already subject to Chapter 10 can, subject to the applicable rules, be extracted through payroll or dividends without being taxed again — with relief limited to the relevant deemed direct payment. You need to distinguish carefully between income already subjected to the off-payroll rules and other company profits. Mixing the two without adequate records makes later payroll, dividend and Self Assessment treatment harder than it needs to be.

Outside IR35

For an outside-IR35 engagement, your client pays your PSC without applying off-payroll PAYE deductions. Your company then accounts for its income and allowable business costs in the normal way, and you can consider how to withdraw money from it. Salary passes through payroll; dividends can only be paid from sufficient distributable profits. Receiving £20,000 into your company bank account does not automatically create £20,000 of dividend capacity. You still need to account for expenses, previous distributions and your company's tax position before deciding what can come out.

Your PSC and you as its director are separate taxpayers, but the two positions are closely connected. Your company can have Corporation Tax liabilities, while you personally may receive salary, deemed employment income, dividends and income from other sources. Each of those feeds into the next calculation.

Director salary and National Insurance

For 2026/27, the employee National Insurance primary threshold is £12,570 a year and the employer secondary threshold is £5,000 a year. For a standard category A employee, employee National Insurance is 8% on earnings between the primary threshold and the £50,270 upper earnings limit, while the standard employer rate is 15% above the secondary threshold. Those thresholds differ, which matters when you are deciding on your director salary. Employment Allowance eligibility is also worth checking: a limited company cannot claim it where there is only one director and that director is the only employee liable for secondary Class 1 National Insurance. Your salary figure should be assessed alongside Corporation Tax, National Insurance, available company profits and your wider income rather than in isolation. Professional payroll services used as part of your wider accounting process help keep payroll records and company accounts aligned.

Dividends and the personal tax position

The dividend allowance for 2026/27 is £500. Above that, dividend income is taxed at 8.75% within the basic-rate band, 33.75% within the higher-rate band and 39.35% within the additional-rate band, per the current HMRC rates and allowances. The amount you actually pay depends on your wider taxable income, so dividends should not be assessed independently from salary and other income. Where qualifying income has already been taxed under Chapter 10, the normal dividend rates should not simply be applied again without considering the double-taxation rules.

Corporation Tax and distributable profits

Dividends come from profits available for distribution, which means Corporation Tax is part of the calculation rather than a separate year-end bill. For a company with a 12-month accounting period and no associated companies, the small profits rate is 19% for profits of £50,000 or less, while the main rate is 25% for profits above £250,000, with Marginal Relief applicable between those limits. Those thresholds can be reduced where your company has associated companies. Before taking a substantial dividend, you need current accounts showing your company's profit position — the cash balance alone is not enough.

The following areas need to be considered together before significant decisions are made:

For a PSC contractor, the question should go beyond whether an accountant can prepare annual accounts. A more useful test is whether the adviser understands IR35, payroll, Corporation Tax, dividends and Self Assessment well enough to see how one decision affects another. The following questions are a reasonable starting point.

Will they review each contract rather than assume a permanent status?

You should be cautious about treating yourself as permanently inside or outside IR35. Status depends on the individual engagement and the underlying contractual terms and working practices. Where you change client, renew a contract on materially different terms or work under several arrangements at once, your accounting records and advice should reflect those differences.

Will they connect payroll, Corporation Tax and dividend planning?

If payroll is being run without reference to your company accounts, while dividends are being decided from the bank balance and Corporation Tax is not calculated until year-end, the individual numbers may be correct but the overall planning can still be weak. Those figures should be brought together before decisions are made.

Can they explain how inside-IR35 income is treated when you later withdraw it?

Where tax has already been applied under Chapter 10, your records need to make clear which income has already suffered employment taxes and which represents ordinary company profits. That requires more than knowing the headline IR35 rules.

Will they consider your Self Assessment position before recommending dividends?

A dividend that looks reasonable from your company accounts alone can have a different personal tax consequence once your complete Self Assessment position is considered. Your accountant should be working from both views before recommending a distribution.

Where your records are current, you can normally build a clearer view of liabilities before filing deadlines arrive. Before making a large withdrawal, you ideally want visibility over expected company profit, estimated Corporation Tax, salary already processed, available distributable reserves, dividends already declared, inside-IR35 income already taxed and likely personal tax liabilities. That does not remove every variable, but it gives a far stronger basis for planning.

Specialist contractor accountants can provide more than statutory year-end accounts — and for a PSC contractor with mixed IR35 outcomes, that broader scope is where the value sits.