#interest
Calculate and track interest income and expenses
From 1 July 2025, the ATO's General Interest Charge and Shortfall Interest Charge are no longer tax-deductible — even on old tax debts. With GIC around 11% compounding daily, the after-tax cost of ATO debt jumped from roughly 7–8% to full sticker price. Here's how the incurred-date rule works and what to do about existing debt.
With the Fed holding rates at 3.5%–3.75% through mid-2026, a business keeping $100,000 in a 0% checking account forgoes roughly $3,500–$4,000 a year. This guide compares top business savings APYs (Axos ~3.60%, Bluevine up to ~3.75%, Live Oak, Lili, Grasshopper), explains Insured Cash Sweep coverage beyond the $250,000 FDIC limit, and shows how to split operating, reserve, and surplus cash.
The prime rate — not the federal funds rate — drives variable business loan payments. It sits at 6.75% in mid-2026, with SBA 7(a) loans priced at Prime + 2.25%–3.0%. Here's the payment math on a quarter-point cut (about $37/month on a $250,000 loan) and how to plan around the Fed's uncertain rate path.
FASB's ASU 2025-09, issued November 2025, makes five targeted fixes to hedge accounting: a 'similar risk' standard for grouped cash flow hedges, a 'choose-your-rate' framework for variable-rate debt, broader nonfinancial asset hedge eligibility, simpler net written option rules, and dual hedge mismatch relief. Public companies must comply for periods beginning after December 15, 2026; private companies get until after December 15, 2027, with early adoption permitted.
Form 8697 look-back interest settles the gap between estimated and actual results on long-term contracts reported under the percentage-of-completion method — the IRS recomputes prior-year income with final figures and charges or refunds interest only, without reopening those returns. This guide covers who must file under IRC Section 460, the three-step calculation, the separate-filing rule for interest refunds, and what the Excel PCM calculator the IRS released on May 29, 2026 does and doesn't do.
How ag equipment dealerships should track floor-plan interest per unit, re-mark trade-in inventory as used tractor prices fall, and measure parts-department absorption rate — where the national average sits in the mid-60s percent and under 50% signals trouble.
Divide 72 by an annual rate and you get the approximate years for money to double: $50,000 at 9% doubles in 8 years, while a 24% credit card balance doubles what you owe in 3. How business owners can use the Rule of 72 to compare investments, price debt, and gauge inflation's drag on idle cash.
The Rule of 78 front-loads loan interest so a lender on a 48-month, $8,000-interest equipment loan has earned about 74% of that interest by month 24 — gutting the savings from early payoff. Here's how precomputed loans work, where they're still legal under 15 U.S.C. § 1615, and how to spot one before you sign.
As of mid-2026, competitive business savings accounts pay roughly 3.5%–3.75% APY while the national average sits near 0.4% — a $150,000 idle balance in a 0.01% checking account forgoes about $5,000 a year. A timeline-based framework for placing tax reserves, operating buffers, and balances above the $250,000 FDIC limit into high-yield savings, CD ladders, ICS/CDARS sweep programs, and Treasury money market funds.
A below-market loan triggers Section 7872, which treats forgone interest as taxable income to the lender even when no cash changes hands. This guide covers the $10,000 and $100,000 de minimis exceptions, the gift tax connection, and how charging the AFR avoids the whole problem.
The OBBBA restores a personal car-loan interest deduction—up to $10,000 per year, above-the-line, for tax years 2025 through 2028—on new U.S.-assembled vehicles financed after December 31, 2024. Mechanics covered include the MAGI phase-out starting at $100K single / $200K joint, Form 1098-VLI reporting beginning in 2026, mandatory VIN entry on Form 1040, and edge cases for refinances, trade-ins, leases, and co-signers.
Section 163(h) decides whether your largest Schedule A line is a $14,000 deduction or an $8,500 one. Here is how the permanent $750,000 TCJA cap, the grandfathered $1 million pre-2018 loans, the HELOC "substantial improvement" rule, and the 2026 return of the mortgage insurance premium deduction actually work — with worked examples and the records you need on audit.
