FINANCING GUIDE

How to Calculate Interest During Construction

Interest during construction follows the debt balance created by phased loan draws.

What the analysis measures

Calculate interest on opening debt plus the timing-weighted current draw. Beginning-, middle- and end-of-month conventions produce different results.

Identify whether interest is paid by equity, capitalised into debt or funded from a reserve. Capitalised interest can create circular loan sizing.

Include fees, base-rate curves, margins, floors and extension periods when material. Do not apply the annual rate to total cost from day one.

Reconcile cumulative draws, interest, repayments and closing debt each month. Stress delays because they increase both interest and equity needs.

CLEAR ANSWERS

What does “How to Calculate Interest During Construction” explain?

Interest during construction follows the debt balance created by phased loan draws.

Which assumptions matter most?

Review the inputs connected to interest during construction, IDC, construction debt and test them together rather than one at a time.

Should I use a calculator or a full model?

Use a calculator for a fast screening result and a full model when timing, financing, operating detail and sensitivities affect the decision.

Can this guide replace professional advice?

It is educational and does not replace deal-specific investment, accounting, tax, legal or lending advice.

Are the linked tools free?

All calculators and guides are free. Full Excel models are priced individually and as a complete library.