#interest
Calculate and track interest income and expenses
A Section 6603 deposit freezes IRS underpayment interest on contested tax while preserving your appeal, Tax Court, and withdrawal rights. This guide covers the written designation under Rev. Proc. 2005-18, when a deposit beats a payment, LIFO withdrawal mechanics, and the procedural traps that turn planned deposits into accidental payments.
A Section 6603 deposit halts interest on a disputed IRS liability without paying the tax, conceding the position, or forfeiting Tax Court access. Revenue Procedure 2005-18 spells out the mechanics—a written designation that names the tax, year, amount, and basis for disputability.
A practical 2026 playbook for small businesses using a Treasury-bill ladder to earn ~3.66% on idle operating cash, capture the state and local tax exemption on Treasury interest, and keep the bookkeeping clean.
Informal family or employer loans below the AFR trigger IRC Section 7872 imputed interest, treated as gifts, wages, or dividends.
OBBBA permanently restored the EBITDA-based ATI calculation for Section 163(j) starting in 2025, expanding deductible business interest for capital-intensive companies. A guide to the 30% cap, the ~$31M small business exemption, the 35% syndicate trap, EBIE allocations from partnerships, S-corp differences, and Form 8990 reporting.
IRS Form 1098 reports your mortgage interest paid and is the key document for claiming the mortgage interest deduction on Schedule A. Covers every box on the form, 2026 deduction limits, the expanded SALT cap, and step-by-step filing instructions.
Loan principal is the original amount borrowed—distinct from interest, which is a deductible expense. This guide covers how amortization front-loads interest charges, how to correctly split principal and interest in your books, and four proven strategies to pay down debt faster while avoiding prepayment penalties.
APR bundles a loan's interest rate and all lender fees into a single number, revealing the true cost of borrowing. Learn how to calculate APR, compare competing loan offers, and spot red flags in merchant cash advances and short-term financing.
Understand how principal and interest interact, model payoff scenarios, and use Beancount to accelerate loan repayment.
