What is Day-1 calibration in IFRS 13 fair value?

On the day a private credit asset is originated, the transaction price (entry price) is generally taken to equal fair value (exit price). Day-1 calibration solves for the discount rate — typically a credit spread over a risk-free benchmark — that makes the model present value equal the amount invested. That implied spread becomes the anchor carried forward to later measurement dates.

How does the calibrated spread change after Day 1?

The implied spread is held and adjusted only when there is documented evidence that market conditions or the borrower’s credit quality have changed — for example a move in a relevant credit-spread index, or a change in leverage or coverage. Every adjustment is recorded, so the chain from transaction price to current mark stays auditable.

Day-1 calibration of private credit marks

IFRS 13 takes the origination transaction price as fair value on Day 1. Calibration solves the implied spread that makes the model agree, then carries it forward and adjusts only on documented evidence. Done properly, it is the backbone of a defensible mark — and a full audit trail. This is how Verus does it.

Conclusion first

IFRS 13 is explicit that, on origination, the transaction price is generally taken to equal fair value. Calibration is the discipline of making the model honour that: solve for the discount rate that makes present value equal the amount invested, then carry that anchor forward and move it only on documented evidence. A mark that is not calibrated to its own Day-1 price is the most common — and most challengeable — error in private credit valuation. A calibrated mark, with the adjustment chain stored, is defensible end to end.

1. Solve at origination

Build the discounted-cashflow from the contractual terms and invert it against the issuance price to recover the implied spread — the single credit spread over the risk-free curve that makes the model value equal the invested amount. In Verus this is solved by bisection to a tight tolerance and bounded to a sane spread range, so the anchor is exact rather than assumed.

2. Carry the anchor forward

At each later measurement date, the calibrated spread is the starting point — not a fresh guess. It is adjusted only for documented change:

Market drift. A move in the relevant credit-spread benchmark, bucketed by rating and market environment, shifts the spread by a defensible, sourced amount.
Credit migration. A change in the borrower’s leverage or coverage moves the spread to reflect the new risk.
Curated override. Where a specific, evidenced view is preferred, it is applied explicitly — never silently.

3. Store the trace

Every recalibration records the implied spread at origination, the drift applied, the source of that drift, and the final spread used. Verus appends each event to an immutable history keyed to the deal, so the path from transaction price to today’s mark can be replayed and defended. This is what turns “we used 650 bps” into “here is exactly why the spread is 650 bps today, and what it was at every prior date.”

Why it matters for audit

It answers the first audit question. “Does your Day-1 fair value equal the price you paid?” A calibrated model answers yes by construction.
It separates market moves from credit moves. The trace shows how much of a change in value came from spreads widening versus the borrower deteriorating.
It removes the “own estimate” objection. A frequent IFRS 13 finding is a risk-free rate plus a subjective view of value. Calibration to an observed transaction price is the market-based discipline that avoids it.

Deterministic IFRS 13 valuation — where calibration sits in the full method.
Deterministic vs stochastic valuation — why a single calibrated path is the right default.
Methodology — the calibration workflow in full, including the CalibrationTrace.
Sample report — a Verus output with the spread build-up shown.

To see calibrated marks on your own positions, book a demo.