The computation of capital gains tax

Welcome to Capital Gains Tax (CGT)!

Hello there! If you’ve ever sold something for more than you paid for it—like a rare comic book, some shares, or an investment property—you’ve made a "gain." Capital Gains Tax (CGT) is simply the tax the government collects on that profit. Don't worry if tax sounds intimidating; at its heart, CGT is just a bit of subtraction and then applying a percentage. In this chapter, we will learn exactly how to calculate that gain and work out how much tax is owed to HMRC.

1. The Golden Rule: The Basic Formula

Before we dive into the details, let's look at the "Big Picture." Calculating a capital gain is like checking your profit on a side hustle. You take what you sold it for and take away what it cost you.

The Basic Computation:
Disposal Proceeds (What you sold it for)
Less: Incidental costs of disposal (Selling costs like legal fees or advertising)
= Net Disposal Proceeds
Less: Allowable costs (What you originally paid + buying costs + improvements)
= Chargeable Gain / (Loss)

Example: Imagine you bought a painting for \( \$10,000 \) and paid \( \$500 \) in auction fees. Years later, you sell it for \( \$20,000 \) but have to pay a \( \$1,000 \) commission to the gallery. Your gain is \( \$20,000 \) (Sold) - \( \$1,000 \) (Gallery fee) - \( \$10,500 \) (Total original cost) = \( \$8,500 \).

Quick Review: What are "Allowable Costs"?

1. Acquisition Cost: The price you paid for the asset.
2. Incidental Costs of Purchase: Stamp duty, legal fees, or surveyor fees paid when you bought it.
3. Enhancement Expenditure: Money spent that adds value to the asset (like building a conservatory on a house). Important: Normal repairs (like painting a wall or fixing a leaky roof) are not allowed here because they just maintain the value, they don't "enhance" it.

Summary: CGT is only charged on the profit (the gain), not the total amount of money you receive.

2. The Annual Exempt Amount (AEA)

Did you know that every individual gets a "tax-free' slice" of gains every year? This is called the Annual Exempt Amount (AEA). Think of it like the Personal Allowance for your income, but specifically for your capital gains.

Key Rules for the AEA:
- It is a fixed amount set for the tax year.
- If you don’t use it, you lose it! You cannot carry it forward to next year.
- It is deducted from your total gains for the year to find your Taxable Gain.

\( \text{Total Chargeable Gains} - \text{Annual Exempt Amount (AEA)} = \text{Taxable Gains} \)

Common Mistake to Avoid: Don't try to use the AEA to create a loss. If your gain is \( \$2,000 \) and the AEA is \( \$3,000 \), your gain just becomes zero. You don't get a \( \$1,000 \) "bonus" loss to use elsewhere!

3. Dealing with Capital Losses

Sometimes, investments go down in value. If you sell an asset for less than it cost you, you have a Capital Loss. The taxman is actually quite fair here: you can use these losses to reduce your gains.

How to use losses:

1. Current Year Losses: Must be set against Current Year Gains first (before the AEA).
\n2. Brought Forward Losses: If you still have gains left after using current year losses and the AEA, you can use losses from previous years.
\n3. Memory Aid: Use the "C-A-B" rule: Current year losses first, then AEA, then Brought forward losses.

Key Takeaway: Losses are your friends in the world of tax—they help lower your tax bill!

4. Calculating the Tax: The Rates

Now for the part everyone wants to know: "How much tax do I actually pay?" The rate of tax depends on two things: your income level and the type of asset you sold.

Step 1: Check the Asset Type

There are two "buckets" for rates:
\n- Residential Property: (e.g., a buy-to-let house). These are taxed at higher rates.
\n- Other Assets: (e.g., shares, antiques, gold). These are taxed at lower rates.

Step 2: Check your Income Tax Band

We look at your Taxable Income first to see how much of your Basic Rate Band (the \( \$37,700 \) limit for most years) is still "empty."

- Basic Rate Taxpayers: If your gain fits into the unused basic rate band, you pay the lower rates (10% for general assets / 18% for residential property).
- Higher/Additional Rate Taxpayers: If your gain is above the basic rate band, you pay the higher rates (20% for general assets / 24% for residential property).

Analogy: Imagine your Basic Rate Band is a bucket. Your salary goes in first. If the bucket isn't full, your capital gains can go in and be taxed at the cheap rate. Once the bucket is full, any leftover gains have to go into the "Expensive Bucket" (Higher rates).

5. Reporting and Paying CGT

For most assets, you report your gains on your annual Self-Assessment tax return. However, there is a special, much faster rule for UK Residential Property.

The 60-Day Rule: If you sell a UK residential property (and have tax to pay), you must report the gain and pay the tax to HMRC within 60 days of completing the sale. This is a very common exam topic, so keep it in mind!

Summary: General gains follow the normal tax year cycle, but residential property gains have a "fast-track" 60-day deadline.

Final Checklist for Success

When you are sitting in your exam and see a CGT question, follow these steps:
1. Calculate the Gain: (Proceeds - Costs).
2. Apply Losses: Take off any current year losses.
3. Deduct the AEA: Use that tax-free allowance!
4. Find the Rate: Check if it's property or shares, and see how much "Basic Rate Band" is left.
5. Calculate Tax: Multiply the taxable gain by the correct percentage.

Don't worry if this seems tricky at first! The more you practice the "pro-forma" (the layout), the more natural it will become. You've got this!