One Unsupported Cost Can Weaken Your Whole Tax Case Oct 13, 2026 Linda Pavan A material unsupported cost can affect more than one deduction. Check that invoices, contracts, delivery records and creditor balances support the tax return. AWR BOOKKEEPING Belastingdienst Burden of proof GOVERNANCE LEDGER & TAX cash flow corporate income tax tax evidence unsupported cost tax burden of Read more