Decoded: Decumulation and preparing for retirement
Aberdeen breaks down four key investing terms and explains why you should know what they mean.
Duration: 3 Mins
Date: 25 Aug 2026
Retirement planning has changed significantly over recent decades. While previous generations often relied on employer-sponsored pension schemes that paid a guaranteed income, today we are more likely to have to make important decisions ourselves about how our retirement savings are invested and accessed.
Today, terms such as 'decumulation’, ‘Defined Benefit’, ‘Defined Contribution’, and ‘tax wrapper’ are becoming more common. But what do these terms actually mean?
What is decumulation?
Most investors spend much of their working lives building retirement savings. This is known as the accumulation phase.
Decumulation refers to the process of using those savings in retirement. Rather than paying money into a pension fund, investors begin withdrawing from it to help fund their lifestyle.
For most retirees, this involves balancing the need for income today while managing their savings to continue supporting them in the future.
Andrew Zanelli, Head of Technical Engagement, at Aberdeen Adviser says: "Retirement planning doesn't stop when you finish working. For many people, the real challenge begins when they need to turn savings into a reliable income. Understanding concepts like decumulation can help savers approach retirement with greater confidence."
What is the difference between Defined Benefit and Defined Contribution pensions?
Defined Benefit (DB)
A Defined Benefit (DB) pension provides a retirement income based on a formula set by the pension scheme. This is usually linked to factors such as your final salary and length of service.
DB pensions were once the most common form of workplace pension in the UK, particularly in the public sector and among large employers. However, many private-sector schemes have closed to new members because of the rising cost of providing guaranteed retirement income.
Despite this decline, DB pensions remain a significant part of the UK retirement system. According to The Pensions Regulator, private-sector DB schemes held around £1.24 trillion2 in assets as of September 2024.
Defined Contribution (DC)
A Defined Contribution (DC) pension works differently. Contributions are invested over time into a pension pot. Factors such as contributions paid, investment performance and charges all impact the value available at retirement.
Unlike DB pensions, the retirement income is not guaranteed. Instead, the amount you receive will depend on the size of the pension pot and decisions you make about how much income you take.
The growth of DC pensions means more people are making decisions about investment strategy, retirement income and decumulation themselves. Membership of occupational DC schemes now significantly exceeds membership of private-sector DB schemes3.
Why should you care if your pension is DB or DC?
The shift from DB to DC pensions means more people are responsible for decisions about investing, retirement income and decumulation strategies.
Understanding which type of pension that you have is a crucial step in planning for retirement.
What is a tax wrapper?
A tax wrapper is simply a structure that allows investments or savings to be held in a tax-efficient way.
Think of it as a container around an investment. The underlying investment might be shares, bonds, funds or cash, while the wrapper determines how it is treated for tax purposes.
Common examples include:
- Pensions (including self-invested pensions or SIPPs)
- Individual Savings Accounts (ISAs)
- Life Assurance Bonds
Different tax wrappers offer different advantages and can play an important role in long-term financial planning.
Why are these concepts important?
Whether you're decades away from retirement or approaching it now, understanding pension terminology can help you make more informed financial decisions.
In simple terms:
- Decumulation is spending your retirement savings.
- DB pensions provide a predetermined retirement income.
- DC pensions build a retirement pot through contributions and investment growth.
- Tax wrappers help investments grow in a tax-efficient environment.
While the terminology may sound complex, understanding these concepts can make navigating retirement planning much easier.
Explore more from our Decoded series:
- p.18, Financial Lives 2024 Survey: Financial Advice & Support – Selected Findings (May 2025)Opens in new window
- The Pensions Regulator, Estimated DB scheme universe funding splits and assets under management (27 January 2025). Opens in new window
- Occupational defined contribution landscape in the UK 2024, The Pensions RegulatorOpens in new window
