{
  "slug": "irs-installment-agreement-calculator",
  "title": "IRS Payment Plan Cost Calculator",
  "heading": "IRS Installment Agreement Cost Calculator",
  "category": "financial",
  "url": "https://www.revenuelab.fyi/toolbox/irs-installment-agreement-calculator",
  "summary": "Monthly payment plus the penalties and interest the IRS keeps charging.",
  "description": "An IRS installment agreement stops collection pressure, but the balance keeps accruing interest and a reduced failure-to-pay penalty for every month it stays open. This calculator shows what a plan really costs: the setup fee, the monthly payment needed to clear the balance in your chosen number of months, and the interest and penalty stacked on top along the way. The IRS charges interest at the federal short-term rate plus 3 percentage points, adjusted quarterly, and a failure-to-pay penalty of 0.25% per month while an approved installment agreement is in effect (0.5% without one), capped at 25% of the unpaid tax. Setup fees in 2026 run about $22 for an online direct-debit plan, $69 online without direct debit, and $178 when arranged by phone or mail, with waivers for low-income filers. Use the result to compare a plan against paying with savings or a lower-rate loan — for many taxpayers the IRS is cheaper than a credit card but more expensive than a home equity line.",
  "formula": "Monthly Payment ≈ Balance ÷ Months + accruals. Total Cost = Balance + Setup Fee + Σ(Interest + 0.25%/mo penalty on declining balance).",
  "dateModified": "2026-09-06",
  "run_url": "https://www.revenuelab.fyi/api/public/calc?tool=irs-installment-agreement-calculator",
  "inputs": [
    {
      "id": "balance",
      "label": "Tax balance owed",
      "kind": "number",
      "hint": null,
      "default": 12000,
      "unit": "$",
      "min": 100,
      "max": 500000
    },
    {
      "id": "months",
      "label": "Months to pay it off",
      "kind": "number",
      "hint": null,
      "default": 36,
      "unit": "months",
      "min": 2,
      "max": 72
    },
    {
      "id": "interestRate",
      "label": "IRS interest rate (annual)",
      "kind": "number",
      "hint": null,
      "default": 7,
      "unit": "%",
      "min": 0,
      "max": 15
    },
    {
      "id": "setupFee",
      "label": "Setup fee",
      "kind": "select",
      "hint": null,
      "default": "22",
      "options": [
        {
          "value": "0",
          "label": "Waived — low income"
        },
        {
          "value": "22",
          "label": "$22 — online, direct debit"
        },
        {
          "value": "69",
          "label": "$69 — online, no direct debit"
        },
        {
          "value": "178",
          "label": "$178 — by phone or mail"
        }
      ]
    }
  ],
  "outputs": [
    {
      "id": "monthlyPayment",
      "label": "Estimated monthly payment",
      "format": "currency",
      "hint": null,
      "primary": true
    },
    {
      "id": "totalCost",
      "label": "Total you will pay",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "interest",
      "label": "Interest charged",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "penalty",
      "label": "Failure-to-pay penalty",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "extraPct",
      "label": "Cost above the tax owed",
      "format": "percent",
      "hint": null,
      "primary": false
    }
  ],
  "worked_example": {
    "inputs": [
      "Tax balance owed: 12000 $",
      "Months to pay it off: 36 months",
      "IRS interest rate (annual): 7 %",
      "Setup fee: $22 — online, direct debit"
    ],
    "outputs": [
      "Estimated monthly payment: $385",
      "Total you will pay: $13,872",
      "Interest charged: $1,295",
      "Failure-to-pay penalty: $555",
      "Cost above the tax owed: 15.6%"
    ]
  },
  "how_to": {
    "title": "How to use this",
    "steps": [
      "Enter tax balance owed ($).",
      "Enter months to pay it off (months).",
      "Enter irs interest rate (annual) (%).",
      "Enter setup fee.",
      "Read your estimated monthly payment on the right — it updates as you type.",
      "Hit Share to keep the scenario or send it to someone."
    ]
  },
  "scenarios": [
    {
      "name": "Conservative",
      "description": "Lower-end numbers — what if things land soft?",
      "values": {
        "balance": 7200,
        "months": 22,
        "interestRate": 4.2,
        "setupFee": "22"
      }
    },
    {
      "name": "Typical",
      "description": "Defaults — the most common real-world setup.",
      "values": {
        "balance": 12000,
        "months": 36,
        "interestRate": 7,
        "setupFee": "22"
      }
    },
    {
      "name": "Ambitious",
      "description": "Higher-end numbers — what if things really pop?",
      "values": {
        "balance": 19200,
        "months": 58,
        "interestRate": 11.200000000000001,
        "setupFee": "22"
      }
    }
  ],
  "limitations": [
    "Results are estimates before tax, fees, and inflation unless an input explicitly covers them.",
    "Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.",
    "This is educational maths, not financial advice. Check anything contractual with the lender or your accountant."
  ],
  "faq": [
    {
      "q": "Does an installment agreement stop penalties?",
      "a": "It halves the failure-to-pay penalty from 0.5% to 0.25% per month, but does not stop it or the interest. Both continue until the balance is zero, which is why shorter plans cost far less overall."
    },
    {
      "q": "Can I get the setup fee waived?",
      "a": "Taxpayers at or below 250% of the federal poverty line can qualify for a waived or reimbursed fee, and direct-debit online plans always cost the least. Select the waived option to model that."
    },
    {
      "q": "Is a credit card cheaper?",
      "a": "Rarely. Card APRs of 20%+ plus a payment processing fee of roughly 1.8-2% beat the IRS's single-digit interest only in unusual cases. A home equity line or credit union personal loan is more often the cheaper route."
    },
    {
      "q": "Are these exact IRS figures?",
      "a": "The interest rate is set quarterly and defaults here to a recent typical level — check the current rate and adjust the input. Penalty mechanics and fee tiers follow published IRS rules but this is an estimate, not tax advice."
    }
  ],
  "related": [
    "https://www.revenuelab.fyi/toolbox/debt-settlement-savings-calculator"
  ],
  "license": "CC-BY-4.0",
  "citation": "RevenueLab — IRS Payment Plan Cost Calculator (https://www.revenuelab.fyi/toolbox/irs-installment-agreement-calculator)"
}