Sales tax in Nova Scotia

Nova Scotia reduced its harmonized rate effective April 1, 2025. Rate changes are a quiet source of error in bookkeeping: documents issued before the change must keep the rate they were charged at, while everything after uses the new one — and reports spanning the boundary have to hold both.

SeroBooks maintains rates in a destination matrix with effective dates, so documents pick up a change on the day it applies and history keeps what history had.

Two things are worth confirming whenever a province moves: that documents dated after the change carry the new rate, and that the tax report for a period spanning the boundary still reconciles against the sales ledger. Both are visible on screen rather than needing a manual sample.

Historic corrections — a credit note against an older invoice — reverse at the rate the line was sold at, which is what the law expects.

Tax is decided per line, not per invoice. Each line's treatment comes from the product's tax category and the place of supply, so a GST-only item and a GST-plus-provincial item sit on the same sale without anyone thinking about it. Combined rates split into their federal and provincial halves in the ledger — one payable account per tax actually levied — which is what lets a return be filed from the books rather than rebuilt in a spreadsheet.

The Tax report then reads that same ledger for any period: taxable sales by rate with the base for each, zero-rated sales counted rather than dropped, credit notes netted, and a self-check against the sales ledger that says so out loud when the two disagree. Input tax credits accrue from purchase documents as they are entered.