--- title: "Self Assessment Tax for High Earners in Cardiff | TCK" description: "Self Assessment support for £100k+ earners. Accurate returns, multiple income handled, reliefs checked, and deadlines met with clear guidance." canonical: "https://www.tckaccounting.co.uk/services/self-assessment-for-high-earners-over-pound100k" --- ![A person at a desk reviewing business documents and a checklist, reflecting preparation for accounting tasks.](/_next/image?url=%2Fapi%2Fmedia%2Ffile%2Fquickbooks-mtd-preconnection-checklist-hero.png%3Fv%3D1769183245309&w=1536&q=75&dpl=dpl_HkjxAMLz8SoKDEaYz6gDcGJLMf1v) Self Assessment tax returns # Self Assessment for High Earners (Over £100k) [Book a free consultation](https://www.tckaccounting.co.uk/redirect-contact) If your income is over £100k, your Self Assessment can become more complex and more costly if it is wrong or late. This service prepares and submits your UK tax return accurately, checks reliefs and allowances, and helps you plan payments so there are no surprises. ## What the service covers Your return is handled end to end, with a focus on accuracy, compliance, and keeping your tax position clear. - Review of your income sources and whether a return is needed - Collection and checking of figures and documents (P60, P45, P11D, dividend vouchers, pension statements and more) - Completion of the Self Assessment tax return and any relevant supplementary pages - Checks for common high earner issues, such as the personal allowance taper over £100k - Review of pension contributions, Gift Aid, and other reliefs to ensure they are claimed correctly - Support with dividends, savings interest, property income, and other additional income - Calculation of tax due and Payments on Account, with clear payment dates - Submission to HMRC and help responding to straightforward HMRC queries ### Who this is for This service is a good fit if you are time-poor, want confidence in the numbers, and have more than a simple PAYE position. It is especially relevant if you earn over £100k and any of the following apply: - You are a company director or owner-manager taking salary and dividends - You are a contractor or consultant with multiple engagements - You receive bonuses, benefits in kind, or have a P11D - You have rental income, investment income, or overseas income - You have made pension contributions or Gift Aid donations and want to claim the right relief - You need to manage Child Benefit charges or other clawbacks ### How the service is delivered 1. **Initial review**: confirm what needs to be filed and flag any risk areas early. 2. **Information request**: you get a clear checklist tailored to your situation. 3. **Preparation**: figures are compiled, cross-checked, and your draft return is prepared. 4. **Approval and submission**: you review the draft in plain English, then the return is submitted to HMRC. 5. **Payment plan**: you receive a summary of tax due and key dates, so you can plan cash flow. ### After the return is filed You will know what you owe, why you owe it, and when it is due. Where appropriate, you can also get forward-looking support, such as adjusting for Payments on Account, avoiding avoidable charges, and planning ahead for the next tax year based on your income mix. [Book a free consultation](https://www.tckaccounting.co.uk/redirect-contact) ## Frequently Asked Questions Do I need to file a Self Assessment if I earn over £100k? Many people over £100k still need to file, but it depends on how you are paid and whether you have untaxed income or charges to report. A quick review of your situation can confirm the requirement and avoid unnecessary filings. What information do you need to complete my return? Typically this includes PAYE documents (P60/P45), details of benefits (P11D), dividend and interest figures, and evidence of pension contributions and Gift Aid. You will receive a checklist based on your income sources so nothing is missed. Can you help me understand Payments on Account? Yes. If Payments on Account apply, you will be told what is due and when, and how it links to your current year bill. You will also be advised when a reduction may be appropriate and what evidence is needed. Can you include dividends, rental income, or capital gains? Yes, these can be included where relevant, using the correct sections of the return. You will be asked for specific supporting figures, and the tax impact will be explained clearly before submission. When should I start, and what are the key deadlines? Earlier is better, especially if you have multiple income sources or information to gather. The online filing and payment deadline is usually 31 January, and a second Payment on Account may be due on 31 July if it applies to you. [Book a free consultation](https://www.tckaccounting.co.uk/redirect-contact) ## Related Services Complete your experience with these services - Self Assessment Income, Gains & Expenses Review [View](/services/self-assessment-income-gains-and-expenses-review) - Self Assessment Penalty Avoidance Support [View](/services/self-assessment-penalty-avoidance-support) - Early Self Assessment Filing (Plan Your Tax Bill) [View](/services/early-self-assessment-filing-plan-your-tax-bill) - Paper Self Assessment Return Support (31 October) [View](/services/paper-self-assessment-return-support-31-october) Show more services - Self Assessment Deadline Management (31 January) [View](/services/self-assessment-deadline-management-31-january) - Self Assessment After an HMRC Notice to File [View](/services/self-assessment-after-an-hmrc-notice-to-file) - Self Assessment for Additional Income Sources [View](/services/self-assessment-for-additional-income-sources) - Self Assessment for Child Benefit High Income Charge [View](/services/self-assessment-for-child-benefit-high-income-charge) - Self Assessment for Landlords (Rental Income) [View](/services/self-assessment-for-landlords-rental-income) - Self Assessment for Self-Employed Individuals [View](/services/self-assessment-for-self-employed-individuals) - Self Assessment for Company Directors [View](/services/self-assessment-for-company-directors) - Self Assessment Tax Return Preparation & Filing [View](/services/self-assessment-tax-return-preparation-and-filing) ## Related Blog Posts - [![Person at a desk in a small office environment reviewing documents and using a laptop, symbolizing business accounts preparation.](/_next/image?url=%2Fapi%2Fmedia%2Ffile%2Fqa-filing-profit-figures-uk-business.png%3Fv%3D1769514403751&w=1536&q=75&dpl=dpl_HkjxAMLz8SoKDEaYz6gDcGJLMf1v) ### Do I Still File a Self Assessment Return if I Don’t Know My Profit Yet? Yes—HMRC says you must still file. Use provisional figures, tell HMRC, then amend your return once your final profit is known. Read more ](/blog/do-i-still-file-a-self-assessment-return-if-i-dont-know-my-profit-yet) - [![A computer on a desk in a small business office setting, displaying accounting software.](/_next/image?url=%2Fapi%2Fmedia%2Ffile%2Fhmrc-vat-software-editorial-uk-small-business.png%3Fv%3D1769183233536&w=1536&q=75&dpl=dpl_HkjxAMLz8SoKDEaYz6gDcGJLMf1v) ### MTD for VAT Penalties: What HMRC Says About Filing Without Functional Compatible Software HMRC says it may charge a penalty of up to £400 for every VAT return filed without functional compatible software under MTD for VAT. Read more ](/blog/mtd-for-vat-penalties-what-hmrc-says-about-filing-without-functional-compatible-software)