IRS Publication 1457 – Actuarial Valuations Version 4A – In the realm of tax planning, accurate valuation of financial interests like annuities, life estates, and remainders is crucial for compliance with income, estate, and gift tax regulations. IRS Publication 1457, titled “Actuarial Valuations Version 4A,” serves as an essential resource for taxpayers, accountants, and estate planners. This revised publication, released in June 2023, provides detailed actuarial tables and examples to facilitate these valuations under Internal Revenue Code (IRC) Section 7520. Whether you’re dealing with charitable contributions, pooled income funds, or inheritance planning, understanding this document can help ensure precise calculations and avoid costly errors.
What is IRS Publication 1457?
IRS Publication 1457 is a guide that outlines actuarial factors for valuing future interests in property for tax purposes. It focuses on remainders, income interests, and annuities for one life, two lives, or terms certain, applicable to income, estate, and gift taxes. The “Version 4A” update incorporates the latest mortality data from around 2010, known as Table 2010CM, and applies to valuation dates on or after June 1, 2023.
This publication is part of a trio of related IRS documents:
- Publication 1457 (Version 4A): Covers standard annuity, income, and remainder factors.
- Publication 1458 (Version 4B): Addresses unitrust interests.
- Publication 1459 (Version 4C): Deals with remainder interests in depreciable property.
These tables are mandated by tax law, with exceptions for qualified retirement plans and certain other scenarios outlined in regulations like 26 CFR Parts 1, 20, and 25. The factors are based on the Section 7520 interest rate, which is 120% of the applicable federal mid-term rate, rounded to the nearest 0.2%. For charitable transfers, you may elect to use the rate from one of the two prior months.
Historical Evolution of Actuarial Tables
The IRS actuarial tables have evolved to reflect changing mortality trends and economic conditions. Here’s a brief timeline:
- 1951–1970: Based on US1938 mortality at a fixed 3.5% interest rate.
- 1971–1983: Used Table LN at 6% interest.
- 1983–1989: Employed Table CM at 10% interest.
- 1989–1999: Shifted to 80CNSMT mortality with variable Section 7520 rates.
- 1999–2009: Updated to 90CM mortality.
- 2009–2023: Relied on 2000CM mortality (from around 2000 census data).
- 2023 onward: Adopts 2010CM mortality (from 1999–2001 U.S. Decennial Life Tables), effective June 1, 2023.
A transition period from May 1, 2019, to June 1, 2023, allowed use of either 2000CM or 2010CM tables, but consistency across all interests in the same property was required. Tables are updated roughly every decade based on U.S. census data.
Key Actuarial Tables in Publication 1457
Publication 1457 includes several tables with factors for interest rates from 0.2% to 20.0% in 0.2% increments, assuming annual compounding. These are available on the IRS website for download in spreadsheet format. Below is a summary of the main tables:
| Table Name | Description | Use Case |
|---|---|---|
| Table S | Single life factors for annuities, life estates, and remainders. | Valuing interests based on one person’s life. |
| Table R(2) | Two-life last-to-die remainder factors (divided into five parts for different interest rate ranges). | Remainder interests payable after the death of the last survivor. |
| Table B | Term certain factors for annuities, income, and remainders. | Interests limited to a fixed number of years. |
| Table H | Commutation factors (Dx, Nx, Mx). | Advanced calculations for combined life and term interests. |
| Table K | Adjustment factors for annuities payable at the end of periods (annual, semi-annual, etc.). | Adjusting for payment frequency. |
| Table J | Adjustment factors for term certain annuities payable at the beginning of periods. | Similar to Table K but for beginning-of-interval payments. |
| Table 2010CM | Underlying mortality table (lx values to seven digits). | Basis for all life-contingent factors. |
For rates not exactly matching the tables, linear interpolation is permitted, especially for pooled income funds. Software can also compute factors using underlying formulas, provided they match the publication’s precision.
How to Use the Tables for Tax Valuations?
To use these tables effectively:
- Determine the Section 7520 Rate: Look up the rate for the valuation month (or elect a prior month for charitable deductions).
- Identify the Interest Type: Choose the appropriate table (e.g., Table S for single life, Table R(2) for joint lives).
- Apply Factors: Multiply the factor by the property’s value to get the present worth.
- Adjust for Payments: Use Table K or J for non-annual payments.
- Ensure Consistency: Use the same mortality basis (2010CM) for all related interests.
For estate taxes, value remainders at death using last-to-die or first-to-die factors. In gift taxes, apply to future interests like pooled income fund remainders. Income tax valuations might involve life estates or survival annuities.
Practical Examples from Publication 1457
The publication includes examples to illustrate applications:
- Temporary Annuity: Present value of $1 per year for 10 years or until death (age 60, 2.8% rate) = $8.1791.
- Joint and Survivor Annuity: $1 per year until last death (ages 60 and 65, 4.2% rate) = $15.4617.
- Last-to-Die Remainder: $1 payable at last death (ages 60 and 65, 4.2% rate) = $0.35061.
- Pooled Income Fund Remainder: Interpolated factor for 3.636% yield (ages 60 and 65) = $0.40038.
These examples demonstrate derivations like first-to-die annuities by subtracting survivor values from single-life sums.
Why This Publication Matters in 2026?
As of February 20, 2026, Publication 1457 Version 4A remains the standard for post-June 2023 valuations, helping professionals navigate complex tax scenarios amid evolving mortality data. For prior versions or additional tables, visit the IRS actuarial tables page. Always consult a tax advisor for personalized application, as improper use could lead to audits or penalties.
Download the full PDF at https://www.irs.gov/pub/irs-pdf/p1457.pdf for in-depth factors and computations.