Form IR957A Proforma Profits Tax Computation for a Sole Proprietorship

Understanding the Form IR957A Proforma Profits Tax Computation for a Sole Proprietorship

Form IR957A is a supporting schedule for self-employed individuals in Hong Kong. It shows the Inland Revenue Department how the business’s assessable profit or adjusted loss was calculated from its accounts. Sole proprietorships and other unincorporated businesses file Form BIR52 as their main profits tax return, not the corporate Form BIR51. The IR957A accompanies the BIR52.

This is not a standalone return. It is a computation sheet that helps the Inland Revenue Department verify business income and expenses have been correctly adjusted for tax purposes, separating accounting profit from taxable profit.

Sole Proprietorship Profits Tax Form HK

A sole proprietorship in Hong Kong follows a different profits tax filing process from a corporation. The business owner reports business income through their individual tax return (BIR60) and the separate BIR52 profits tax return for unincorporated businesses. The sole proprietorship profits tax form hk system requires the proprietor to compute their assessable profits using the IR957A proforma.

The form captures these key elements:

• Gross business receipts or turnover
• Cost of goods sold or direct expenses
• Gross profit or loss
• Other business income
• Operating expenses
• Adjusted profit or loss before tax adjustments
• Non-allowable expenses added back
• Capital allowances claimed
• Balancing charges or allowances
• Net assessable profits or adjusted loss

Claim only expenses wholly and exclusively incurred for the production of assessable profits. Exclude all private or domestic expenses.

Form IR957A Guide

The form IR957A guide from the Inland Revenue Department provides instructions for each line item of the proforma, clarifying which expenses are deductible and which must be added back. Common non-allowable items include:

• Private motor vehicle expenses
• Domestic entertainment costs
• Capital expenditure (depreciation)
• Fines and penalties
• Donations to charities not approved under section 26C of the Inland Revenue Ordinance (Cap. 112)

The guide explains how to compute tax depreciation allowances. This includes the initial and annual allowance for plant and machinery, and the commercial building allowance for qualifying structures.

Hong Kong Unincorporated Business Tax

The Hong Kong unincorporated business tax regime applies the same territorial principle as corporate profits tax: only profits arising in or derived from Hong Kong are chargeable. For a sole proprietorship, the assessable profits are computed on the IR957A and are then included in the proprietor's personal assessment or charged separately under profits tax.

The tax rate for unincorporated businesses is lower than the corporate rate. For the year of assessment 2024-25, the standard profits tax rate for sole proprietorships is 7.5% on the first HK$2 million of assessable profits and 15% on the remainder, subject to the two-tiered profits tax regime. The proprietor may also claim personal allowances and deductions through their individual tax return (BIR60), which can reduce the overall tax liability.

Proforma Tax Computation Sole Trader

A proforma tax computation sole trader must follow the standard format prescribed by the Inland Revenue Department. The IR957A is a vertical computation starting with net profit per accounts and ending with assessable profits. The adjustments section includes:

• Add back: depreciation, donations, private expenses, provisions, and other non-allowable items
• Deduct: capital allowances, balancing charges, and other allowable deductions

Prepare the computation for the basis period, which is usually the calendar year ending 31 December for sole proprietorships. If the business uses a different accounting date, the basis period follows the year of assessment rules under section 18B of the Inland Revenue Ordinance.

IR957A Filing Instructions

The IR957A filing instructions require the proprietor to submit the completed proforma with the BIR52 profits tax return. The filing deadline is generally within one month from the date of issue of the return, unless an extension has been granted by the Inland Revenue Department.

Key filing requirements include:

• Attach a copy of the business registration certificate
• Include the tax representative's details if an agent files the return
• Submit supporting schedules for capital allowances claimed
• Provide a breakdown of gross receipts if turnover exceeds HK$5 million
• Sign and date the declaration

The Inland Revenue Department may request additional information or supporting documents, such as bank statements, invoices, or rental agreements, to verify claimed expenses.

Interaction with Personal Tax

Assessable profits computed on the IR957A flow into the proprietor's personal tax computation. The proprietor may elect for personal assessment under section 41 of the Inland Revenue Ordinance, which aggregates all income sources (business, employment, and property) and applies progressive tax rates. Alternatively, the profits tax liability is computed separately and added to any salaries or property tax payable.

The IR957A also captures the proprietor's capital allowances, which are claimed against business profits. Unused allowances may be carried forward to subsequent years of assessment. The form must show the opening written down value, additions, disposals, and closing written down value for each asset class.

Business Tax Portal and Electronic Filing

The Inland Revenue Department encourages electronic filing through the Business Tax Portal. For the year of assessment 2025-26 onwards, mandatory electronic filing applies to in-scope multinational enterprise groups. While sole proprietorships are not yet subject to mandatory e-filing, the department has stated an intention to reach full electronic filing by 2030.

When filing electronically, the IR957A proforma can be uploaded as a supporting document in PDF or iXBRL format. The tax representative portal allows authorised agents to file on behalf of their clients. The proprietor must ensure the computation matches the figures reported on the BIR52 and BIR60.

Common Errors and Compliance Tips

Sole proprietors should avoid these common mistakes when completing the IR957A:

• Claiming depreciation instead of capital allowances
• Including private expenses such as personal motor vehicle costs
• Failing to add back non-allowable provisions
• Incorrectly computing the basis period
• Omitting the business registration certificate number

The Inland Revenue Department may impose penalties for incorrect or incomplete returns. Retain all supporting records for at least seven years after the relevant year of assessment.

Where to Obtain Form IR957A

The Inland Revenue Department forms index at https://www.ird.gov.hk/eng/paf/bus.htm provides the latest version of Form IR957A. The department revises forms periodically, so always download the current version rather than using a saved copy. The form can be completed manually or using the fillable PDF version on the department's website.

For further guidance, refer to the Inland Revenue Department's Profits Tax Guide or consult a qualified tax adviser to assist with preparing the proforma computation and ensuring compliance with the Inland Revenue Ordinance (Cap. 112).