Non-allowable (or non-deductible) expenses are costs incurred by a business that cannot be subtracted from revenue for tax purposes because they are not "wholly and exclusively" for business. Key examples include personal expenses, client entertainment, fines, penalties, and commuting costs. These costs do not reduce taxable income.
Allowable Expenses: These are wholly and exclusively incurred in producing taxable income. Disallowable Expenses: These are personal expenses, capital in nature, or unrelated to business operations.
An unallowable cost is a cost that cannot be paid by your contract or grant.
Here are some examples of disallowable expenses:
An allowable expense is money spent by your employees to conduct company business. These expenses are eligible for reimbursement under company policies. Examples include business travel, business meals, and purchasing goods or services necessary for work.
Allowable expenses may be paid for using University funding or reimbursed if you pay out of pocket. Non-allowable expenses generally cannot be paid for using University funding and will not be reimbursed.
Many business expenses are 100% deductible, including advertising, employee wages, rent, supplies, and certain business meals like company parties or meals for the public, while personal deductions like student loan interest or charitable donations (depending on the type) can also be fully deductible for individuals. The key is that the expense must be "ordinary and necessary" for your trade or business or meet specific IRS criteria, often differentiating from the 50% rule for client meals.
100% write-offs, primarily through bonus depreciation, allow businesses to immediately deduct the full cost of qualifying new and used assets (like equipment, machinery, vehicles, and certain improvements) in the year they're placed in service, rather than depreciating them over years, significantly boosting cash flow and lowering taxes, with recent laws making this 100% deduction permanent for assets acquired after January 19, 2025. This is a major tax incentive under recent legislation, often used alongside Section 179 expensing, which offers its own high deduction limits, notes Forbes.
Entertainment business expenses generally are not deductible. Commuting costs to your primary place of employment are not deductible. Charitable donations to certain organizations may not be tax deductible. Pledges and undocumented cash donations are not deductible.
Lost or stolen personal property (including cash) Costs incurred at home, such as childcare, pet care or lawn/home maintenance, cleaning services. Personal expenses such as haircut, toiletries, clothing, etc. Costs incurred due to unreasonable failures to cancel transportation or hotel reservations.
Disallowable expenses are costs that you cannot deduct from your turnover when calculating your taxable profit.
Subscriptions and services can quickly add up and become a significant source of avoidable charges. Many people forget to cancel subscriptions after a free trial or promotional period ends, resulting in ongoing costs. Review credit card statements or bank records to help identify and cancel unused subscriptions.
If your laundry expenses pass the wholly, exclusively and necessarily test, you can claim self-employed expenses. You do this when you do your Self Assessment tax return.
The IRS does not allow deductions for expenses tied to breaking the law or failing to meet regulatory requirements. These payments are treated as penalties, not business costs. This includes government fines, parking tickets, late tax payment penalties, bribes, and kickbacks.
Allowable costs
Here are some examples of records that can be used to claim deductions instead of using receipts:
Writing off groceries as a business travel expense
Grocery costs are tax-deductible once you're away from home and traveling for business. As long as you're away overnight, you can deduct 50% of your grocery costs (as long as they're not lavish or extravagant).
The "$1000 instant tax deduction" refers to a proposed Australian tax policy, specifically from the Albanese Labor government in 2025, allowing eligible workers to claim a flat $1,000 deduction for work-related expenses without needing receipts, simplifying tax returns for those with lower expenses but potentially costing those with higher expenses, starting from 1 July 2026. It's an option to replace itemised work-related deductions, not an extra refund, and doesn't affect non-work-related deductions like charity.
Errors in Social Security numbers, names, or addresses are surprisingly common. Double-check all personal information on your forms and make sure it matches official records. Failing to include all W-2s, 1099s, or receipts for deductions can trigger audits or processing delays.
If you itemize, you can deduct these expenses:
Here are 8 tax deductions you may be able to claim at tax time: