Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add Receiptor-AI/bookkeeping-skills --skill estimated-taxesgit clone --depth 1 https://github.com/Receiptor-AI/bookkeeping-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/receiptor-ai/bookkeeping-skills/estimated-taxes)<a href="https://agentmods.dev/skills/receiptor-ai/bookkeeping-skills/estimated-taxes"><img src="https://agentmods.dev/badge/skills/receiptor-ai/bookkeeping-skills/estimated-taxes/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/receiptor-ai/bookkeeping-skills/estimated-taxes"><img src="https://agentmods.dev/badge/skills/receiptor-ai/bookkeeping-skills/estimated-taxes.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00096 | $0.02208 |
| Opus 5.5 | $0.00038 | $0.00883 |
| Sonnet 5.5 | $0.00019 | $0.00442 |
| Haiku 4.5 | $0.00010 | $0.00221 |
Grade A, and why
estimated-taxes scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 158 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Estimated Tax Payments
Calculate and schedule quarterly estimated tax payments to avoid underpayment penalties. Essential for self-employed individuals, freelancers, and small business owners who don't have taxes withheld from a paycheck.
Why you need to pay quarterly
Employees have taxes withheld every paycheck. Self-employed people don't. The IRS expects to receive tax payments throughout the year, not one lump sum in April. If you wait until filing to pay everything, you'll owe an underpayment penalty.
You must make estimated payments if you expect to owe $1,000 or more in tax for the year after subtracting withholding and credits.
You're exempt if: You had zero tax liability last year (100% of prior-year tax is $0), or your withholding from other sources (W-2 job, pension, etc.) covers your expected tax.
Payment schedule
| Quarter | Covers income from | Payment due |
|---|---|---|
| Q1 | January 1 – March 31 | April 15 |
| Q2 | April 1 – May 31 | June 15 |
| Q3 | June 1 – August 31 | September 15 |
| Q4 | September 1 – December 31 | January 15 (next year) |
Note: Q2 covers only 2 months and Q3 covers 3 months — the periods are uneven. If a due date falls on a weekend or holiday, the deadline moves to the next business day.
How to pay: IRS Direct Pay (irs.gov/payments), EFTPS (Electronic Federal Tax Payment System), credit/debit card (processors charge a fee), or mail a check with a 1040-ES payment voucher. Direct Pay or EFTPS are free and instant-confirmation.
The two things you're paying
1. Self-employment tax (Social Security + Medicare)
This is the self-employed equivalent of FICA. Employees pay 7.65% and their employer pays 7.65%. As a self-employed person, you pay both halves.
Calculation:
Net Schedule C profit $100,000
× 92.35% (adjustment factor) × 0.9235
= Self-employment tax base $92,350
× 15.3% (12.4% Social Security + 2.9% Medicare) × 0.153
= Self-employment tax $14,130
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2mo ago First seen · 158 lines · 96 tokens per session scan A 32edd1427051
estimated-taxes is a skill published in the GitHub repository Receiptor-AI/bookkeeping-skills (8 stars, last pushed 8d ago), licensed MIT. It adds 96 tokens to every session and 2,208 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
Other skills, from other repositories
brazil-vat
> Use esta skill sempre que perguntarem sobre tributos indiretos brasileiros, IVA, tributos sobre o consumo, PIS, Cofins, ICMS, ISS, IPI, CBS, IBS, Imposto Seletivo, NF-e (Nota Fiscal Eletronica), NFS-e, Simples Nacional, registro de CNPJ, reforma tributaria (EC 132/2023, LC 214/2025, LC 227/2026) ou qualquer questao…
au-partnerships
Use this skill whenever asked about Australian partnership taxation -- partnership tax returns (form P), how section 90 net income or partnership losses flow through to partners under section 92, partner salaries and drawings, non-commercial loss deferral for partner shares, CGT on fractional partnership interests…
az-payroll
Tier 2 Arizona content skill for employer payroll compliance covering tax year 2025. Includes the 2.5% flat PIT (phased down from 4.5% over 2022-2023), A-4 state W-4 expressed as percentage of federal withholding (0.5-3.5% options), A1-QRT quarterly withholding, A1-R annual reconciliation, AZ UI wage base $8,000 with…
bb-income-tax
Use this skill whenever asked about Barbados personal income tax, NIS contributions, or payroll obligations. Trigger on phrases like "how much tax do I pay in Barbados", "BRA", "Barbados Revenue Authority", "TAMIS", "PAYE Barbados", "NIS contributions", "National Insurance Barbados", "self-employed tax Barbados"…
am-cross-border
Prepare Armenia 2026 corporate and personal cross-border workpapers: establish residence and permanent-establishment status, classify Armenian-source receipts, separate PE profit from non-attributed income, compute domestic nonresident withholding and reconcile capped foreign-tax credit. Covers offshore services…
albania-vat
Albanian VAT (TVSH, tatimi mbi vlerën e shtuar) for tax year 2026 under Law No. 92/2014 as amended to Law No. 80/2025, Council of Ministers Decision No. 953/2014 and Law No. 87/2019 on invoices and fiscalisation. Covers the 20% standard rate, the 6% and 10% reduced rates and what each covers, 0% exports and…