---
title: "Pension Fund | Altss Glossary"
description: "A pension fund is the pool of assets, usually held in trust, from which a pension plan pays retirement benefits; in private markets the term mostly means…"
canonical: "https://altss.com/glossary/pension-fund"
---

Glossary · Allocator type

# Pension Fund

Also called: pension plan · retirement system

A pension fund is the pool of assets, usually held in trust, from which a pension plan pays retirement benefits; in private markets the term mostly means defined benefit plans, which commit to private funds to help meet long-dated liabilities.

Publisher: Altss LLC Published 2025-12-24 Content modified 2026-10-02

ALTSS-ALLOC-002

Employers, unions and governments set up pension plans to pay workers in retirement; the pension fund is the money set aside to do it. In a defined benefit plan the benefit is fixed by formula and the sponsor must cover any shortfall, so the fund invests against those future payments. In a defined contribution plan each member has an account and bears the investment result. Which law governs the plan depends on who sponsors it.

### Formal definition

Under Employee Retirement Income Security Act (ERISA) section 3(2)(A), codified at 29 U.S.C. 1002(2)(A), an employee pension benefit plan is any plan, fund or programme established or maintained by an employer, an employee organisation or both that provides retirement income to employees or results in a deferral of income to the end of covered employment or beyond. ERISA section 3(34) defines a defined contribution (individual account) plan; section 3(35) defines a defined benefit plan as any pension plan that is not an individual account plan.

## Formula

### Funded ratio

```
Funded ratio = plan assets / pension liability
```

`A`

plan assets, at market value or at a smoothed actuarial value, depending on the basis

`L`

pension liability: the present value of benefits earned to date (actuarial accrued liability or an accounting obligation), discounted at the basis's discount rate

Funded status is reported on several bases: actuarial (used to set contributions), accounting (in a corporate sponsor's financial statements) and, in some regimes, regulatory or buy-out bases. The discount rate drives the liability, so ratios are comparable only on the same basis. Some reports show the deficit (L − A) instead of the ratio.

## Defined benefit and defined contribution

In a defined benefit (DB) plan the sponsor promises a benefit set by formula (salary, service), and the fund's investment result changes how much the sponsor must contribute. These plans hold large pooled portfolios run by a board or investment committee and are the pension LPs that commit directly to private funds.

In a defined contribution (DC) plan each participant has an individual account and chooses among the plan's investment options, so the participant bears the investment risk. Where DC plans offer private-markets exposure it usually comes through pooled or multi-asset products chosen by the plan fiduciary, not through fund commitments made in the plan's own name.

## Who sponsors the plan decides which law applies (US)

- **Public (governmental) plans** are plans established or maintained by federal, state or local governments for their employees (ERISA section 3(32)). They are excluded from ERISA Title I (section 4(b)(1)) and are governed by state or local law and their own boards. See public pension fund.
- **Corporate single-employer plans** are employee benefit plans established by an employer and are generally subject to ERISA Title I, including its fiduciary rules (section 4(a)). The Pension Benefit Guaranty Corporation (PBGC), which ERISA created, insures private-sector defined benefit plans through a single-employer programme. See corporate pension fund.
- **Multiemployer (Taft-Hartley) plans** receive contributions from more than one employer under collective bargaining agreements (ERISA section 3(37)). Labor Management Relations Act section 302(c)(5) requires employees and employers to be equally represented in administering the trust fund. PBGC runs a separate multiemployer programme.
- **Church plans** are also outside Title I unless they elect in (section 4(b)(2)).

Outside the US, pension funds sit under national regimes, for example Australian superannuation funds and UK occupational schemes. MiFID II treats pension funds and their management companies as per se professional clients in the EU.

## Funded status, liquidity and private-markets behaviour

A DB fund pays benefits every month, so it must keep liquid assets for benefit payments and for capital calls even though its liabilities run for decades. Mature plans, where benefit payments exceed contributions, need more of it. Funded status and the sponsor's contribution policy shape how much illiquidity the board accepts.

Private-markets programmes are managed against a policy target with ranges. When public markets fall faster than reported private valuations, the private allocation rises above target (the [denominator effect](https://altss.com/glossary/denominator-effect)) and new commitments are often slowed until the weight normalises. Many plans set the policy mix through asset-liability management studies.

## Rules that reach managers who take pension money (US)

- **Pay-to-play.** Public pension plans are "government entities" under Advisers Act Rule 206(4)-5. If an adviser or one of its covered associates contributes to an official of that government entity, the adviser may not provide advisory services to it for compensation for two years, subject to the rule's de minimis and other exceptions; and an adviser may pay a third party to solicit the plan only if that party is a regulated person. The Securities and Exchange Commission (SEC) published a proposal to rescind the rule in the Federal Register on 10 September 2026 (comments due 9 November 2026); as of 2 October 2026 the rule remains in force. See political contributions rule.
- **Plan assets.** Taking ERISA plan money brings the plan-asset question: if, immediately after the most recent acquisition of any equity interest, benefit plan investors hold 25% or more of the value of any class of a privately offered fund's equity, the fund's underlying assets are treated as [plan assets](https://altss.com/glossary/plan-assets) (to the extent of the benefit plan investors' share), unless another exception applies, such as operating-company status as a VCOC (ERISA section 3(42); 29 CFR 2510.3-101(a)(2), (d), (f)(1)).
- **Tax.** A pension trust that qualifies under IRC section 401(a) is exempt from income tax (section 501(a)) but is taxed on its unrelated business taxable income (section 511(b)), which includes the debt-financed share of income from leveraged investments ([UBTI](https://altss.com/glossary/ubti); sections 512(b)(4) and 514); section 514(c)(9) provides an exception for certain real property acquired by qualified pension trusts if its conditions are met.
- **Eligibility.** State and local government plans with total assets over $5 million and ERISA plans meeting Rule 501(a)(1)'s conditions are accredited investors.

## Worked examples

### Illustrative plan funded ratio ($ billions)

A plan holds 8.4 of assets against a liability measured at 10.5. Its funded ratio is 8.4 / 10.5 = **80.0%**, a deficit of 2.1.

### The same plan at a lower discount rate

A lower discount rate raises the measured liability to 11.7 with assets unchanged. The ratio falls to 8.4 / 11.7 = **71.8%** and the deficit widens to 3.3. Nothing in the portfolio changed; the measurement did.

Examples are illustrative; figures are not market data.

## Not the same as

- [Sovereign Wealth Fund (SWF)](https://altss.com/glossary/sovereign-wealth-fund): The Santiago Principles exclude government-employee pension funds from the sovereign wealth fund definition, but include government pension reserve funds that have no explicit pension liabilities.
- [Endowment](https://altss.com/glossary/endowment): An endowment supports a nonprofit through a spending policy and owes no contractual benefits; a DB pension fund must meet defined benefit payments.
- Superannuation Fund: Superannuation is Australia's mainly defined contribution system with its own regulator and rules; it is a national form of pension fund, not a synonym for every pension fund.

## How it is classified

- Classify a pension fund by sponsor type (public, corporate single-employer, multiemployer, church) and by benefit design (DB, DC).
- Record each plan or trust separately from its sponsor and from any investment board, consultant or outsourced chief investment officer (OCIO) that manages it; relate them, never merge.
- Classify a government pension reserve fund without explicit pension liabilities as a sovereign wealth fund, not a pension fund.

## Common mistakes

- Saying ERISA governs public pension plans. Governmental plans are excluded from ERISA Title I; state and local law applies.
- Comparing funded ratios measured on different discount-rate or asset-valuation bases.
- Treating a defined contribution plan as an LP that makes its own fund commitments.
- Recording the sponsor (a state, a company, a union) as the investor. The LP of record is the plan's trust or the board or investment entity that holds its assets.
- Assuming a long horizon removes liquidity needs. Benefit payments and capital calls draw on liquid assets every month.
- Quoting "typical" private-markets allocations or commitment sizes for pension funds without a dated primary source such as the plan's own annual report.

## Edge cases

- One state investment board may manage the assets of several separate plans; each plan remains a separate legal fund with its own beneficiaries.
- A government fund that saves for future pension costs but has no explicit pension liabilities is classed as a sovereign wealth fund (pension reserve fund) under the Santiago Principles.
- Church plans are outside ERISA Title I unless they elect to be covered.
- A frozen corporate DB plan that is de-risking may stop new private-markets commitments while its existing fund interests run off.

## Questions

### Does ERISA apply to public pension funds?

No. ERISA section 4(b)(1) excludes governmental plans from Title I, so state and local law governs them. Federal rules aimed at their advisers, such as the SEC pay-to-play rule, still apply.

### Why do pension funds slow new commitments when stock markets fall?

Falling public markets shrink the total portfolio faster than reported private valuations, so the private allocation rises above its target. Funds often slow new commitments until the weight returns to its range.

## Sources

1. [29 U.S.C. 1002 - Definitions (ERISA sec. 3, incl. 3(34), 3(35), 3(42))](https://www.law.cornell.edu/uscode/text/29/1002). U.S. Congress (United States Code; LII mirror), Current US Code text as published by LII (accessed 2026-10-01); para. (42) added by Pub. L. 109-280, sec. 611(f) (2006). Status: in force (checked 2026-10-01). ERISA sec. 3(2)(A), 3(32), 3(34), 3(35), 3(37)(A), 3(42) — supports: Pension plan, governmental plan, DC, DB and multiemployer plan definitions; 25% plan-asset test
2. [29 U.S.C. 1003 - Coverage (ERISA sec. 4, incl. 4(b) exclusions for governmental and church plans)](https://www.law.cornell.edu/uscode/text/29/1003). U.S. Congress (United States Code; LII mirror), Current US Code text as published by LII (accessed 2026-10-01). Status: in force (checked 2026-10-01). ERISA sec. 4(a), 4(b)(1)-(2) — supports: Title I coverage of employer plans; governmental plans and non-electing church plans excluded
3. [29 U.S.C. 186 - Restrictions on financial transactions (LMRA sec. 302, incl. 302(c)(5) Taft-Hartley trust funds)](https://www.law.cornell.edu/uscode/text/29/186). U.S. Congress (United States Code; LII mirror), Current US Code text as published by LII (accessed 2026-10-01). Status: in force (checked 2026-10-01). LMRA sec. 302(c)(5) — supports: Equal employee and employer representation in jointly trusteed funds
4. [Who We Are - Pension Benefit Guaranty Corporation](https://www.pbgc.gov/about/who-we-are). Pension Benefit Guaranty Corporation (PBGC), Page last updated 2026-01-27. Status: current (checked 2026-10-01). Who We Are (page updated 2026-01-27) — supports: PBGC created by ERISA (1974)
5. [17 CFR 275.206(4)-5 - Political contributions by certain investment advisers (pay-to-play rule)](https://www.law.cornell.edu/cfr/text/17/275.206(4)-5). U.S. Securities and Exchange Commission (CFR text via eCFR; LII mirror), CFR text current as published by LII (accessed 2026-10-01); last amended 2011. Status: in force (checked 2026-10-01). 17 CFR 275.206(4)-5(a)(1), (a)(2)(i), (b), (f)(5), (f)(9) — supports: Two-year time-out and its exceptions, solicitor payment restriction, government entity includes public pension plans, regulated person
6. [Political Contributions by Certain Investment Advisers (proposed rescission of Rule 206(4)-5), Release No. IA-6994, 91 FR 57698](https://www.govinfo.gov/content/pkg/FR-2026-09-10/pdf/2026-18424.pdf). U.S. Securities and Exchange Commission (Federal Register via govinfo), Release dated 2026-09-03; published 2026-09-10; comments due 2026-11-09. Status: proposed (checked 2026-10-01). 91 FR 57698 (2026-09-10), SUMMARY and DATES — supports: Proposed rescission of Rule 206(4)-5 published 2026-09-10; comments due 2026-11-09
7. [29 CFR 2510.3-101 - Definition of "plan assets" - plan investments (plan asset regulation)](https://www.law.cornell.edu/cfr/text/29/2510.3-101). U.S. Department of Labor, Employee Benefits Security Administration (CFR text via eCFR; LII mirror), eCFR current as of 2026-09-29; no amendment since eCFR baseline. Status: in force (checked 2026-10-01). 29 CFR 2510.3-101(a)(2), (d)(1), (f)(1) — supports: Look-through rule and its exceptions; VCOC; 25% significant participation test
8. [26 U.S.C. 512 - Unrelated business taxable income](https://www.law.cornell.edu/uscode/text/26/512). U.S. Congress (Internal Revenue Code; LII mirror), Current US Code text as published by LII (accessed 2026-10-01). Status: in force (checked 2026-10-01). IRC sec. 512(a)(1), (b)(4) — supports: UBTI definition; debt-financed income included
9. [26 U.S.C. 514 - Unrelated debt-financed income](https://www.law.cornell.edu/uscode/text/26/514). U.S. Congress (Internal Revenue Code; LII mirror), Current US Code text as published by LII (accessed 2026-10-01). Status: in force (checked 2026-10-01). IRC sec. 514(a)-(c)(9) — supports: Debt-financed income and the qualified-organisation real property exception
10. [17 CFR 230.501 - Definitions and terms used in Regulation D (accredited investor)](https://www.law.cornell.edu/cfr/text/17/230.501). U.S. Securities and Exchange Commission (CFR text via eCFR; LII mirror), eCFR current as of 2026-09-29; last amended 2025-02-18 (technical, 90 FR 9684); last substantive amendment effective 2020-12-08 (85 FR 64234). Status: in force (checked 2026-10-01). 17 CFR 230.501(a)(1) — supports: Government and ERISA plans as accredited investors
11. [Sovereign Wealth Funds: Generally Accepted Principles and Practices ("Santiago Principles")](https://ifswf.org/sites/default/files/santiagoprinciples_0_0.pdf). International Working Group of Sovereign Wealth Funds, IWG / IFSWF, October 2008. Status: Current (24 GAPP) (checked 2026-10-01). p.3 and Appendix I, para. 3 — supports: Government-employee pension funds excluded from SWF definition; pension reserve funds without explicit liabilities included
12. [Directive 2014/65/EU on markets in financial instruments (MiFID II), Annex II Professional Clients](https://eur-lex.europa.eu/eli/dir/2014/65/oj/eng). European Parliament and Council, Official Journal of the EU, L 173, 12.6.2014, Adopted 15 May 2014; applied from 3 January 2018 (as extended). Status: In force (amended) (checked 2026-10-01). Annex II, Section I(1)(f) — supports: Pension funds as per se professional clients
13. [How PBGC Operates - Pension Benefit Guaranty Corporation](https://www.pbgc.gov/about/how-pbgc-operates). Pension Benefit Guaranty Corporation (PBGC), Page last updated 2026-07-15. Status: current (checked 2026-10-02). How PBGC Operates: Single-Employer Program; Multiemployer Program (page updated 2026-07-15) — supports: PBGC insures private-sector DB plans through separate single-employer and multiemployer programmes
14. [26 U.S.C. 511 - Imposition of tax on unrelated business income of charitable, etc., organizations](https://www.law.cornell.edu/uscode/text/26/511). U.S. Congress (Internal Revenue Code; LII mirror), Current US Code text as published by LII (accessed 2026-10-02). Status: in force (checked 2026-10-02). IRC sec. 511(b)(1)-(2) — supports: Tax on UBTI of trusts exempt under sec. 501(a)
15. [26 U.S.C. 501 - Exemption from tax on corporations, certain trusts, etc.](https://www.law.cornell.edu/uscode/text/26/501). U.S. Congress (Internal Revenue Code; LII mirror), Current US Code text as published by LII (accessed 2026-10-02). Status: in force (checked 2026-10-02). IRC sec. 501(a) — supports: Section 401(a) trusts exempt from income tax

## Related terms

6 terms

- [Employee Retirement Income Security Act of 1974 (ERISA)](https://altss.com/glossary/erisa)
- [Plan Assets](https://altss.com/glossary/plan-assets)
- [Denominator Effect](https://altss.com/glossary/denominator-effect)
- [Unrelated Business Taxable Income (UBTI)](https://altss.com/glossary/ubti)
- [Commitment Pacing](https://altss.com/glossary/commitment-pacing)
- [Institutional Investor](https://altss.com/glossary/institutional-investors)

## Referenced by

3 terms

- [Investment Consultant](https://altss.com/glossary/investment-consultant)
- [Outsourced Chief Investment Officer (OCIO)](https://altss.com/glossary/ocio)
- [Sovereign Wealth Fund (SWF)](https://altss.com/glossary/sovereign-wealth-fund)

## Concept record

Concept ID

ALTSS-ALLOC-002

Classification

Allocator type

Topics

Institutional investors

Jurisdiction

US

Version

2.0.0

Last reviewed

2026-10-02

Structured data

[JSON](https://altss.com/reference/concepts/pension-fund.json)

Source check

Legal and tax statements checked against the cited primary sources on 2026-10-02 ([how](https://altss.com/methodology)). General information, not advice.

## Canonical URL

https://altss.com/glossary/pension-fund