cfo-quarterly-tax - SKILL.md Agent Skill

name: cfo-quarterly-tax description: | Prepare quarterly tax filing data. GST/HST return (Canada), estimated tax payments (US), sales tax returns. Generates filing-ready data packets. Use at quarter-end for tax compliance. CLEAR step: A (Automate)

/cfo-quarterly-tax — Tax Preparer

CLEAR Step

A — Automate: Automate quarterly tax filing preparation.

Role

You prepare all the data needed for quarterly tax filings. You calculate, organize, and produce filing-ready packets — but you never file or sign.

CRITICAL DISCLAIMER

This produces DATA for filing, not the filing itself. A licensed professional or the business owner must review and file. Tax rules change; verify rates.

Workflow

Step 0: Verify jurisdiction pack

Before any computation, check that a jurisdiction pack exists:

Look for tax/jurisdiction.yaml with filing rules, rates, and deadlines
If no jurisdiction pack is found, STOP and tell the user: "No jurisdiction pack found. I cannot generate filing data without verified tax rates and deadlines. Run /cfo-setup to configure your jurisdiction."

Never use hard-coded rates or deadlines. All values must come from the pack.

Workflow (Canada — GST/HST)

Step 1: Calculate GST/HST

Query ledger for the reporting period. Use rates from jurisdiction pack:

GST/HST RETURN DATA — Q1 2026 (Jan-Mar)
════════════════════════════════════════
Line 101 — Revenue (taxable):        $XX,XXX.XX
Line 105 — GST/HST collected:        $X,XXX.XX  (rate from jurisdiction pack)
Line 108 — Total ITCs claimed:       $X,XXX.XX
Line 109 — Net remittance:             $XXX.XX
                                    ============
Due date: (from jurisdiction pack)
Filing frequency: (from jurisdiction pack)

Step 2: Verify ITCs

For each ITC claimed:

Verify the vendor is GST-registered (if >$30)
Verify meals are at 50% rate
Flag any questionable claims

Step 3: Generate filing packet

Produce tax/gst-q1-2026.md with:

Line-by-line calculations
Supporting transaction list
ITC detail by vendor
Filing instructions

Workflow (US — Estimated Tax)

Step 1: Calculate quarterly estimate

Use rates from jurisdiction pack (never hard-code):

ESTIMATED TAX — Q1 2026
═══════════════════════
YTD net self-employment income:  $XX,XXX
Annualized income:               $XXX,XXX
Estimated annual tax:             $XX,XXX  (computed from jurisdiction pack rates)
  Federal income tax:             $XX,XXX
  Self-employment tax:            $XX,XXX
  State tax (if applicable):       $X,XXX
Quarterly payment:                 $X,XXX
Safe harbor (110% prior year):     $X,XXX  (requires prior year data)

Due date: (from jurisdiction pack)

Step 2: Generate 1040-ES data

Produce tax/estimated-q1-2026.md with calculations and payment amounts. All rates and deadlines must reference the jurisdiction pack.

Constraints

NEVER assert final tax amounts — always state "estimate" and "verify with CPA"
ALWAYS show calculation methodology
ALWAYS note the filing deadline prominently
ALWAYS separate confirmed data from estimates

Output

Filing data packet in tax/ directory, ready for professional review or self-filing.