Tax is calculated separately for each line item on your invoice — this applies to every invoice, whether it includes one service type or several. Each line's tax is rounded to the nearest cent, and the rounded line amounts are added together to produce your invoice total. Applying the same method to every invoice keeps billing consistent and predictable, rather than switching calculation approaches depending on what's on a given invoice.

This is standard practice across accounting platforms, not something unique to CareSmartz360. QuickBooks Online, one of the most widely used accounting systems — calculate and round tax the same way, line by line, on every invoice they process.

If you instead added the taxable amounts first ($83.26) and calculated tax once on that combined total, you'd get $10.8238, which rounds to $10.82 — a one-cent difference from the invoice total above. Neither number is “wrong”; they're just two accepted ways of rounding. C360 uses per-line calculation on every invoice — the same approach QuickBooks uses — so billing works the same way whether an invoice has one service type or several.

Is this a billing error? No. It's the expected result of rounding tax at the line-item level, which is standard practice across accounting platforms including QuickBooks.

Will this affect what I owe or what I'm reimbursed? No. The variance is limited to a few cents per invoice and doesn't change the accuracy of the tax calculated on each service line.

Why not just calculate tax once on the invoice total? Because invoices often include a mix of taxable and tax-exempt services, or services subject to different taxes — so tax needs to be calculated line by line to apply the right treatment to each one. C360 uses this same method on every invoice, so billing stays consistent no matter how many service types are involved.

I only have one service type on this invoice — why is there still a small difference? Because C360 calculates tax the same way for every invoice, regardless of how many service types it includes. If your invoice has multiple line items (for example, several shifts), each line's tax is rounded individually before being added up — producing the same small variance you'd see on a multi-service invoice.

Does this happen on every invoice? Only invoices with multiple taxed line items may show a small variance — typically a cent or two per group of lines, not per invoice as a whole.

Who do I contact if I have questions about a specific invoice? Reach out to CareSmartz360 Support — we're happy to walk through the line-by-line calculation with you.