TPS-TIE

Attributing service income

Service income is attributed under a hierarchy. This means you only move to the next step if you are unable to attribute under the current step.

The department expects most taxpayers will attribute apportionable receipts based on attribution tier #1 because the taxpayer will either have enough information to know where the customer receives the benefit of the service, or there is generally a reasonable method of proportionally attributing receipts available.

The hierarchy for service income is as follows:

Apportionment – the basics

For business and occupation (B&O) tax purposes, apportionment refers to the use of a formula to allocate a business’ income to the appropriate taxing jurisdictions.

If you are a business that is taxable in Washington and another state, you must use our apportionment formula to determine how much of your apportionable income is subject to B&O tax in Washington.

Taxable in another state means your business meets any of the following requirements in the current or prior calendar year: