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grw-labgrw-lab/skills/vat-worksheet/SKILL.md

vat-worksheet

Skill1 starsChanged 35 days agoMITView on GitHub

Sums sales and purchase lines from a CSV into a VAT worksheet. Sales VAT minus purchase VAT is the amount due. Use when someone has a spreadsheet of invoices and wants the VAT totals at 15% or at the rate on each row. Rounds half-up to 0.01 per line. A worksheet for review, not a filed return and not tax advice.

The file

We split this skill into the rules it gives an agent

5 rules. About 0 are common, 3 are distinctive, and 2 are very specific to this project.

  • ≈0

    Common · estimate

    Many files like this have a rule of this kind.

  • ≈3

    Distinctive · estimate

    This author's own choices. Worth a look.

  • 2

    Very specific

    Tied to their project's names, files or tools. Probably skip.

  • Common
  • Distinctive
  • Very specific
  1. Distinctive:

    Add up the VAT already on a list of sales and purchases.

    line 8
  2. Very specific:

    Use columns kind (sale or purchase) and either net or gross.

    line 22
  3. Very specific:

    If vat is filled, keep it.

    line 23
  4. Distinctive:

    Do not drop a line because it looks small.

    line 35
  5. Distinctive:

    Do not change a VAT amount that was already on the row.

    line 36

≈ “Common” is an estimate: at least 1 in 5 of the 350,495 skill files we read have a rule of the same kind, not the same words. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.
Files
SKILL.md

VAT worksheet

Add up the VAT already on a list of sales and purchases. Compute 15% only when a row has a net amount and no VAT figure.

When to use

  • A CSV of sales and purchases needs one VAT total.
  • The user asks what VAT is due from a spreadsheet.

When not to use

  • Building or validating a ZATCA e-invoice. Use zatca-invoice. That skill rounds by VAT category, which is a different rule from summing lines.
  • Deciding whether a supply is taxable. Ask a Saudi tax adviser. Do not guess.

Workflow

  1. Use columns kind (sale or purchase) and either net or gross. Optional: vat, vat_rate (default 0.15), note.
  2. If vat is filled, keep it. If it is empty and net is filled, VAT is net × rate, half-up to 0.01. If only gross is filled, net is gross / (1 + rate), and VAT is gross minus net.
  3. Run:
python scripts/vat_worksheet.py lines.csv --out summary.csv
  1. Report sales net, sales VAT, purchases net, purchases VAT, and VAT due. VAT due = sales VAT − purchase VAT. Say when the number is negative.
  2. Say this is a worksheet. It does not file anything.

Rules

  • Do not drop a line because it looks small.
  • Do not change a VAT amount that was already on the row.
  • Rate 0 means no VAT on that row. Do not replace it with 15%.

Done check

  • The line count in the summary matches the CSV.
  • VAT due equals sales VAT minus purchase VAT.
  • The reply says this is not a filed return.

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