Deposit Premium Calculator

Calculator inputs

Currency

Used for formatting money values.

Policy type

For labeling, not carrier rules.

Effective date

Used to generate payment due dates.

Use detailed exposures

Detailed rows override simple payroll.

Estimated payroll

Used when detailed exposures are disabled.

Rate per 100 payroll

Base premium = payroll/100 × rate.

Exposure items

Add multiple payroll, revenue, or unit lines.

Description	Basis	Amount	Unit divisor	Rate per unit

Exposure row calculation

Row premium = (amount ÷ unit divisor) × rate. Typical divisor is 100 for payroll and 1000 for revenue.

Experience modifier

Multiplier applied to base premium.

Schedule modification (%)

Credits negative; debits positive.

Deductible credit (%)

Reduction on modified premium.

Safety credit (%)

Discount for safety programs.

Claims-free credit (%)

Discount for loss-free history.

Premium discount (%)

Negative values act as surcharge.

Lapse surcharge (%)

Extra load for lapses or late payments.

State surcharge (%)

Applied to modified premium.

Terrorism charge (%)

Percent add-on to modified premium.

Assessment (%)

Guaranty funds and assessments.

Regulatory fee (%)

Filing and regulatory percent fee.

Tax rate (%)

Applied after add-ons and fees.

Flat fees

Any flat policy charges.

Policy fee

Common carrier policy fee.

Inspection fee

Optional inspection or engineering fee.

Broker fee (due now)

Added to deposit for due now.

Minimum premium

Floor applied to annual premium.

Minimum deposit

Floor applied to deposit amount.

Deposit method

Choose percent or fixed deposit.

Deposit percent (%)

Common values: 10 to 50 percent.

Deposit fixed amount

Used when deposit method is fixed.

Installment plan

Controls due date spacing.

Number of installments

Set zero to disable installments.

Installment fee

Fee added to each payment.

Finance charge (%)

Applied to remaining premium after deposit.

First payment offset (days)

Days after effective date for first due date.

Expected exposure change (%)

Used for audit range and sensitivity chart.

Rounding

Rounding impacts installments and totals.

Example data table

Scenario	Base premium	Experience mod	Deposit method	Estimated annual	Deposit premium
Two payroll classes, moderate modifier	$4,795.00	1.05	25%	$5,288.77	$1,322.19
Higher modifier and added assessments	$4,795.00	1.25	30%	$6,689.12	$2,006.74
Fixed deposit with finance charge plan	$4,795.00	1.05	Fixed	$5,288.77	$1,500.00

Examples are illustrative and vary by carrier and jurisdiction.

Formula used

1) Base premium

Simple: base = (payroll ÷ 100) × rate. Detailed: base = Σ[(amount ÷ unit) × rate].

2) Modified premium

modified = base × expMod × (1+schedule) × (1−deductible) × (1−safety) × (1−claims) × (1−discount) × (1+lapse).

3) Annual premium

annual = max(modified + add-ons + fees + tax, minimum premium).

4) Deposit and schedule

deposit = percent×annual or fixed, bounded by minimum deposit and annual. Remaining is financed and split into installments with optional fees.

How to use this calculator

Choose currency, policy type, and an effective date.
Use detailed exposures for multiple classes or bases.
Enter modifiers, credits, surcharges, add-ons, and taxes.
Set deposit method, then select installment schedule options.
Press calculate to view totals, tables, and Plotly charts.
Download CSV or PDF to share and archive results.

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