The Critical Factors: Control and Legal Enforceability
To recognize revenue in the public sector, the entity must establish control over the asset. Control is usually proven when the government gains a legally enforceable claim to the resources. For example, in property taxation, this occurs on the “lien date”—the specific day when the government has a statutory right to seize a property if the tax remains unpaid.
Treatment of Inflows with Return Obligations
If an inflow of cash comes with a binding requirement to perform a service or return the cash, it cannot be recognized as revenue upon receipt. It must be treated as a liability (e.g., Unearned Revenue or Deferred Inflow). Only as the government executes the program or satisfies the conditions is the liability reduced and revenue recognized.
Comparative Time-of-Recognition Framework

Revenue Type IPSAS Accrual Basis GASB Modified Accrual Basis
Income Tax When the income is earned by the citizen (the taxable event). When earned and collected within the current fiscal period or 60 days thereafter.
Property Tax When the period for which the tax is levied begins and a claim arises. On the legal lien date, subject to the current financial availability rules.
Imposed Grant When there is a legal claim and the inflow is probable. When all eligibility requirements are fully satisfied by the recipient agency.
User Fees (Exchange) When the specific service is performed or delivered. When the invoice is generated and payment is due during the fiscal period.