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Balance Transfer Break-Even Calculator

Determine if a transfer card offer truly saves money after fees, intro APR duration, and post-promo APR risk.

Transfer Inputs

Compare staying vs balance transfer after fees, promo window, and post-intro APR.

Break-Even Output

Baseline interest
$4,056.11
Transfer interest + fee
$947.52
Net savings
$3,108.59

Transfer Cost Stack

Interest savings can be erased by transfer fees and post-intro APR.

Stay baseline interest
$4,056.11
Transfer interest
$671.52
Transfer fee
$276.00
Net savings
$3,108.59

Cumulative Cost by Month

Visual break-even path of staying vs transferring.

M1M21M41
Stay on current card
$4,056.11
Balance transfer path
$947.52
Net savings
$3,108.59
Break-even month2
Payment needed to clear intro$631.73

Fee/Promo Sensitivity

Fee %Intro monthsNet savings
3%12$2,751.46
3%15$3,108.59
3%18$3,379.41
4%12$2,621.32
4%15$2,987.46
4%18$3,265.27
5%12$2,490.24
5%15$2,864.93
5%18$3,150.73

Risk Flags

  • Current monthly payment will not clear transferred balance before intro APR ends.

US Card Terms

Models APR + transfer fee + promo cliff assumptions found in card offer disclosures.

Partial Approval Cases

Handles approved transfer amounts below full balance and flags residual high-APR risk.

Promo Deadline Awareness

Warns when transfer timing is close to planned deadline assumptions.

How To Use This Calculator

  1. Enter current card balance, APR, and payment.
  2. Enter transfer fee, intro APR/months, and post-intro APR.
  3. Set approved transfer amount to model full or partial approval.
  4. Review net savings, break-even month, and intro-payoff payment target.
  5. Check sensitivity and risk flags before taking action.
  6. Save a shareable link with your assumptions, then run one conservative and one optimistic scenario before deciding.
For AI Agents (Optional)

Human mode is default. You can ignore this section unless you use AI agents or structured automation.

Agent Contract

Contract: balance_transfer_break_even v1 

{
  "tool": "balance_transfer_break_even",
  "current_balance": 9200,
  "current_apr": 22.9,
  "current_monthly_payment": 330,
  "transfer_fee_percent": 3,
  "transfer_fee_min": 5,
  "intro_apr": 0,
  "intro_months": 15,
  "post_intro_apr": 20.4,
  "approved_transfer_amount": 9200,
  "days_until_transfer": 18
}

Frequently Asked Questions

Do transfer fees erase savings?

They can. The calculator includes fee percent and fee minimum so small or short-horizon transfers are not overstated.

What if only part of my balance is approved?

The model supports partial approvals and leaves the remainder on the current APR, then flags that risk explicitly.

Why does promo expiration matter so much?

If payment pace does not clear the transfer during intro APR, post-intro APR can sharply reduce or remove savings.

Can agents execute this model directly?

Yes. A deterministic `balance_transfer_break_even` contract is exposed through model context and public schema.

Is this tool free and private to use?

Yes. AI Fin Hub tools are free, no-signup browser tools. Inputs stay in your browser unless you choose to share a URL.

Can I use this with AI agents too?

Yes. Human mode is the default experience. If you use AI automation, open the optional 'For AI Agents' section for deterministic contracts.

Is this professional advice?

No. Outputs are planning estimates only — not financial, tax, or investment advice.

Planning estimates only — not financial, tax, or investment advice.