How do I estimate what my actual Short Stock Proceeds Interest (SSPI) rate will be?

Background

In determining the interest that account holders are paid on cash credit balances and charged on debit balances, each currency is assigned to our Reference Benchmark rate. Our Reference Benchmark rate is determined from short-term market rates but capped above/below widely used external reference rates or, where appropriate, bank deposit rates. This page explains how our Reference Benchmark rates are determined…

Short Sales Proceeds Interest (SSPI) is the positive interest rate IBKR pays on short stock cash proceeds according to the Securities Financing page of our website.

This is a credit to the account…

Interactive Brokers’ interest rates are based on the benchmark rates for each currency and may change daily. These benchmarks use a combination of internationally recognized reference rates (such Fed Funds), bank deposit rates, and dynamic interbank rates determined from foreign exchange and money markets to calculate an IBKR Reference Benchmark rate…

The indicative rate is used to estimate the cost to borrow a specific stock. It is calculated using a combination of sources and is displayed along with security availability in our automated securities financing tools. The actual rate to borrow a specific stock is calculated at the end of the day and will…