Why Policy Dates Need to Be Kept Separate
A premium can be associated with several different dates: when the insurer agrees to provide coverage, when the policy takes effect, when an invoice is sent, when payment is due, and when the customer pays. Those dates answer different questions. Confusing them can move premium into the wrong reporting period or suggest that coverage began later than it actually did.
For ratemaking and premium measurement, the central distinction is between when premium is recorded and when the insurer provides coverage. A billing date is an administrative event, and a payment date is a cash event. Neither, by itself, changes the dates on which the insurer assumed risk.
For the examples in this tutorial, assume an insurer uses an accrual basis and records premium as written when a policy is bound or issued. This is an explicit accounting convention for the examples, not a claim that every system uses the same operational timestamp. Under this convention, delayed billing or payment does not postpone the written-premium event. Earned premium is associated with coverage provided during the period. The specific method for allocating premium across a coverage period is a separate question; where an example needs an earned amount, the allocation information will be supplied.
Three Different Premium Measures
The policy timeline supplies the context for these measures. The effective and expiration dates identify the period during which coverage is available. The written-premium convention identifies when the insurer records the premium obligation. The invoice, due, and payment dates describe billing and settlement. A balance may therefore be written but not yet collected, or written but not yet fully earned.
| Question | Date or information that answers it | What it does not establish by itself |
|---|---|---|
| When does the coverage period begin and end? | Policy effective and expiration dates | When an invoice is sent or paid |
| When is premium written? | The applicable accounting convention and the relevant policy transaction date | When cash is collected |
| How much premium is earned by a reporting date? | Coverage provided by that date and the applicable earning allocation | The invoice or payment date alone |
| Has the policyholder paid? | Cash receipt or payment record | Whether coverage has begun or ended |
The exact transaction date used by an insurer's records must be understood before classifying written premium. For example, systems may distinguish a bind date from an issue date. In a problem, use the convention given; do not silently replace it with a billing or payment date. In practice, the underlying policy and accounting records determine which date applies.
How to Read a Delayed-Billing Timeline
A reliable approach is to mark each event separately. First identify the coverage interval. Next identify the event that records written premium under the stated convention. Then examine the reporting date and decide what the timeline establishes about coverage provided by then. Finally, record billing and payment separately, as administrative and cash events.
Write down the effective date and expiration date. Do not infer either from an invoice or receipt.
Use the bind, issue, or other transaction date specified in the problem. Keep that date distinct from the billing date.
Determine whether the policy is not yet in force, in force, or expired at that date. This identifies the coverage status, but an exact earned amount may require an earning allocation.
Note when the invoice was sent and when payment arrived. A delay in either event does not, on its own, revise the coverage interval.
This method also prevents a subtle error: treating the premium's accounting status as evidence that the policyholder has paid. A premium can be recorded as written while the insurer still has an amount to collect. Conversely, cash could arrive before the coverage period starts; receipt of that cash does not mean coverage has already been provided.
Worked Examples
Worked Example: A December Effective Date and a January Invoice
A hypothetical insurer binds and issues a one-year policy on December 10, 2025. The policy covers December 15, 2025, through December 14, 2026, for a total premium of $1,200. The invoice is sent January 5, 2026, is due January 20, and is paid February 2. Under the stated accrual convention, identify the written premium in 2025, the cash collected in 2025, and the policy's coverage status on December 31, 2025.
Step 1: Identify the controlling dates. The written-premium convention uses the bind-and-issue date, December 10, 2025. Coverage starts December 15, 2025. Billing occurs January 5, 2026, and payment occurs February 2, 2026.
Step 2: Classify the written premium. The policy is bound and issued in 2025, so $1,200 is written premium in 2025 under the convention in this example.
Step 3: Classify cash collected. Payment is not received until February 2, 2026. Therefore, cash collected for this premium by December 31, 2025, is $0.
Step 4: Check coverage status at year-end. December 31 falls after the December 15 effective date and before the December 14, 2026 expiration date. The policy is in force on December 31. The exact earned amount at year-end is not determined here because no earning allocation was specified.
Check. The invoice and payment both occur in 2026, but neither changes the 2025 bind-and-issue date or the December 15 coverage start. This method avoids the common mistake of placing the entire premium in 2026 merely because the invoice was sent then.
Worked Example: Coverage Ends Before a Late Payment
A hypothetical equipment policy is issued on March 3, 2026, for a premium of $840. Coverage runs from March 10, 2026, through March 9, 2027. The invoice is sent March 10, 2026, and payment is received April 18, 2027. Assume the policy remains in force for the full stated term, and use the convention that the full premium is earned when the full coverage term has been provided. At March 9, 2027, classify written premium, earned premium under the stated assumption, and cash collected.
Step 1: Written premium. The issue date is March 3, 2026. The premium recorded as written in 2026 is $840.
Step 2: Coverage by the valuation date. The valuation date, March 9, 2027, is the last date of the stated coverage period. The full policy term has been provided by that date.
Step 3: Earned premium under the given condition. The problem states that the full $840 is earned when the full term has been provided. Thus earned premium by March 9, 2027, is $840.
Step 4: Cash collected. Payment is not received until April 18, 2027. Therefore, cash collected by March 9, 2027, is $0.
Check. At the valuation date, the premium is $840 written, $840 earned under the stated condition, and $0 collected. Those amounts differ because they answer three different questions. The late payment does not extend the coverage period beyond March 9.
Worked Example: A Reporting Date Between the Effective Date and Payment
A hypothetical small-business policy is bound and issued on November 20, 2026, for a premium of $1,500. Coverage runs from December 1, 2026, through November 30, 2027. The invoice is sent December 12, 2026, and the policyholder pays January 7, 2027. For this example, the insurer's supplied earning schedule states that $125 is earned in December 2026 and that no other 2026 amount is earned. At December 31, 2026, determine the written premium in 2026, earned premium in 2026 under the supplied schedule, cash collected in 2026, and whether coverage is in force.
Step 1: Apply the written-premium convention. The policy is bound and issued on November 20, 2026. Therefore, written premium in 2026 is $1,500.
Step 2: Use the supplied earning information. The schedule assigns $125 to December 2026. Hence earned premium in 2026 under that schedule is $125. No additional earning calculation is needed or implied.
Step 3: Determine cash collected by year-end. The payment date is January 7, 2027, which is after December 31, 2026. Cash collected by year-end is $0.
Step 4: Check coverage status. December 31, 2026, is after the December 1 effective date and before the November 30, 2027 expiration date. The policy is in force.
Check. The four requested results are $1,500 written, $125 earned under the schedule, $0 collected, and coverage in force. The common mistake is to use the December 12 invoice date as the written date, or to treat the January payment as the beginning of coverage. Neither follows from the stated dates or convention.
Why Coverage Dates Govern Earning
The reason is the substance of the insurance transaction. The insurer provides protection during the coverage period. Premium is therefore associated with the coverage provided, not simply with the administrative act of sending a bill or the later transfer of cash. The accounting convention for written premium records a premium transaction; the coverage dates identify when the risk protection is available.
This distinction can be summarized without assuming a particular earning method:
The equality of two of these amounts in a particular case does not make the concepts identical. For example, when a policy is fully expired and the full premium is due, earned premium may equal written premium under the applicable earning basis. If payment is still outstanding, collected premium can nevertheless be less. Similarly, cash received before a coverage period begins does not make future coverage already earned.
Common Mistakes
- Using the invoice date as the coverage start. An invoice may be sent after the effective date. Coverage status still follows the policy's effective and expiration dates.
- Using the payment date as the written-premium date. Under an accrual convention, premium can be written before it is collected. Follow the convention given in the problem.
- Calling all written premium earned immediately. Written premium and earned premium answer different questions. Coverage may be in force but not yet fully provided.
- Assuming a delayed bill changes the contract term. A late invoice does not automatically postpone the effective date. Any change to coverage must be supported by the policy terms or a separate policy transaction.
- Calculating an earned amount without an earning basis. Coverage dates establish when protection applies, but an exact earned-premium amount also requires the applicable allocation method or supplied earning information.
Check Your Understanding
For each problem, distinguish written premium, coverage status, and cash collection. Use the stated accounting and earning conventions; do not infer a coverage change from a billing delay.
- A hypothetical policy is issued on September 25, 2026, for $960 of premium. Coverage is October 1, 2026, through September 30, 2027. The invoice is dated October 8, 2026, and payment arrives November 3, 2026. Under the accrual convention used in this tutorial, what is written premium in 2026, and how much has been collected by September 30, 2026? (Answer: $960 written in 2026; $0 collected by September 30, 2026.)
- A hypothetical policy's coverage is January 1 through December 31, 2027. It is bound and issued December 20, 2026, for $1,400. The invoice is sent January 4, 2027, and payment is received February 10, 2027. Under the stated convention, in which year is the premium written, and is the policy in force on January 15, 2027? (Answer: Written in 2026; yes, it is in force on January 15, 2027.)
- A hypothetical policy is issued on May 5, 2027, for $720, with coverage from June 1, 2027, through May 31, 2028. Payment is received June 20, 2027. At May 31, 2027, state written premium under the tutorial's convention, cash collected, and whether coverage has begun. (Answer: $720 written in 2027; $0 collected by May 31; coverage has not yet begun.)
- A hypothetical policy is issued November 15, 2026, for $2,000, with coverage November 20, 2026, through November 19, 2027. The invoice is sent December 5, 2026, and paid January 15, 2027. A supplied schedule assigns $180 of earned premium to 2026. At December 31, 2026, what are written premium, earned premium under the schedule, and cash collected? (Answer: $2,000 written; $180 earned under the schedule; $0 collected.)
- A hypothetical policy is issued February 1, 2027, for $500, with coverage February 10 through August 9, 2027. The invoice is sent February 20, but the policyholder pays August 20. Assume the policy remains in force through August 9 and the full premium is earned when that stated coverage term is complete. At August 9, give the coverage status, earned premium under the assumption, and cash collected by that date. (Answer: Coverage term complete; $500 earned; $0 collected by August 9.)