Apply the deduction tests
An expense is incurred when legal liability arises, not merely when paid. It must relate to earning business income and have complete supporting documents retained for at least five years. Private costs, own drawings or remuneration, loan principal, fines and ordinary private-car expenses are excluded. Capital assets generally use capital allowances rather than a depreciation deduction. Payments to relatives must reflect actual work and arm’s-length remuneration. PHC and taxi driving costs have their own rules.
Check specific allowances separately
Qualifying section 14N renovation expenditure is capped at S$300,000 per relevant three-year period, applied per sole proprietor or at partnership level. R&D benefits require the taxpayer to bear the cost and own and exploit the results; ordinary R&D service providers are not automatically eligible. COE can form part of a qualifying vehicle’s capital cost. Fixed expense deductions and incentives such as EIS have separate conditions. Course Fees Relief lapsed from YA 2026; the page’s earlier course-fee reference should not be used as a current claim.
Official source
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