A calculator for estimating Icelandic take-home pay from a gross salary or an employer's total cost. It breaks the result into income tax, pension contributions and related charges using the payday.is public service.

Use it to estimate monthly net pay, employee and employer pension contributions, income tax and employer charges. It is intended for salary planning and payroll-related calculations.

It removes the need to calculate Icelandic tax bands and mandatory contributions manually. It can work backward from the employer's total cost as well as forward from gross pay.

laun — Skill for Claude Code and Codex by jokull: A calculator for estimating Icelandic take-home pay from a…

Install

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.

agentmods

npx agentmods add skills/jokull/icelandic-data/laun

Any agent

npx skills add jokull/icelandic-data --skill laun

Clone the repo

git clone --depth 1 https://github.com/jokull/icelandic-data

Made for: Claude Code, Codex.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/jokull/icelandic-data/laun.svg)](https://agentmods.dev/skills/jokull/icelandic-data/laun)

Your own site

<a href="https://agentmods.dev/skills/jokull/icelandic-data/laun"><img src="https://agentmods.dev/badge/skills/jokull/icelandic-data/laun.svg" alt="Measured on agentmods" height="20"></a>

Per session 21 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 616 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00021	$0.00616
Opus 5	$0.00010	$0.00308
Sonnet 5	$0.00004	$0.00123
Haiku 4.5	$0.00002	$0.00062

Measured 4d ago against content hash 92a527dab89d, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

laun 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 4d 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.

.agents/skills/laun/SKILL.md · 69 lines

How it starts

The opening of the file, as written. The whole thing — 69 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Payday.is Salary Calculator (Laun)

Icelandic take-home salary calculator via payday.is public API.

API

Endpoint: POST https://payday.is/is/ajax/calculator/calculateSalary/
Auth: None (public XHR, requires X-Requested-With: XMLHttpRequest)
Format: JSON request/response

Input Modes

Gross salary — set Salary, leave TotalCost null
Employer total cost — set TotalCost, leave Salary null

2025 Default Rates

Parameter	Default	Description
PensionContributionEmployeePercentage	4.00%	Mandatory employee pension
PensionContributionEmployerPercentage	11.50%	Mandatory employer pension
RehabilitationFundPercentage	0.10%	Starfsendurhæfingarsjóður
IncomeTaxStep1Percentage	31.49%	Up to ~446,136/mo
IncomeTaxStep2Percentage	37.99%	446,136–1,252,501/mo
IncomeTaxStep3Percentage	46.29%	Above 1,252,501/mo
InsuranceFeePercentage	6.35%	Tryggingagjald (employer)
PersonalTaxAllowancePercentage	100%	Persónuafsláttur (72,492 kr/mo in 2025)

Usage

# Monthly gross -> take-home
uv run python scripts/laun.py 1000000

# From employer total cost
uv run python scripts/laun.py 1200000 --total-cost

# With union fee
uv run python scripts/laun.py 750000 --union 1.1

# Full JSON breakdown
uv run python scripts/laun.py 1000000 --json

# Additional voluntary pension (viðbótarlífeyrissparnaður)
uv run python scripts/laun.py 1000000 --additional-pension 4.0

Response Fields

Key fields in the JSON response data:

salary — gross monthly salary
totalCost — total employer cost
payoutAmountSalary — take-home pay
incomeTaxEmployeeTotalAmount — total income tax
pensionContributionEmployeeTotalAmount — employee pension
personalTaxAllowanceAmount — tax credit applied

Caveats

Tax rates change yearly — defaults are 2025 rates baked into payday.is
Union fee varies by union (typically 0.7–1.25%)
Does not account for benefits in kind, car allowance, etc.
Personal tax allowance is per-person; couples can transfer unused allowance via SpouseTaxAllowancePercentage

Read the full file on GitHub · 69 lines

Changes

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.

4d ago First seen · 69 lines · 21 tokens per session scan A 92a527dab89d

Subscribe to this mod's changes

laun is a skill published in the GitHub repository jokull/icelandic-data (52 stars, last pushed yesterday), licensed MIT. It adds 21 tokens to every session and 616 once invoked, about $0.0001 per session on Opus 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 2026-08-30.

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