O-Level POA Adjustments: Decide Whether to Add or Subtract

Ask which period the amount belongs to

In a Singapore N-Level Principles of Accounts discussion, students asked whether amounts in an income calculation should be added or subtracted. That concern is useful beyond one paper: the sign becomes easier to understand when you first identify which income or expense belongs to the accounting period.

This guide is for upper-secondary POA practice, with the linked 2026 O-Level syllabus as its curriculum reference. It does not reconstruct the N-Level question, endorse suggested forum answers or predict marks. Check your own syllabus, question wording and teacher’s required presentation.

Separate money received from income earned

Cash received during a year and income earned during that year are not always the same amount. A receipt can relate to an earlier period or a future period. An amount can also have been earned during the current period but remain unreceived at the reporting date.

Draw a simple timeline covering the accounting period. Place each amount on it and label whether it describes cash movement or income earned. This reduces the temptation to add every figure merely because it appears beside the account name.

Work through one checked income example

Consider an invented example with no opening adjustments. A business receives $5,000 in rent during the year. Of that receipt, $600 relates to the following year, while another $400 earned this year remains unreceived at year end. Current-year rent income is $5,000 minus $600 plus $400, giving $4,800.

The $600 is removed because it is not earned in the current period; the $400 is included because it is. These are explanations of the example’s facts, not a rule that every year-end income figure must be added. Opening balances or differently worded information can change the required calculation.

Apply the same period test to expenses

For a second invented example, again with no opening adjustments, suppose $2,000 is paid for insurance and $300 of that payment covers the next accounting period. The current-period expense is $1,700. The remaining benefit is a prepayment rather than an expense belonging to this year.

If a current-period expense has been incurred but not yet paid, consider the expense and the related amount owing. Do not confuse an expense adjustment with the movement in cash. Record the appropriate double entries and statement effects using the account names and conventions taught in your course.

Check the statements as well as the calculation

After working out the current-year income or expense, ask where any remaining balance belongs. Is it an amount owed to the business, a future benefit, an amount owed by the business or income received for a future period? Explain that meaning before deciding its classification.

SEAB’s O-Level POA syllabus includes end-of-period adjustments in financial statements. A trial balance that agrees is not by itself proof that the accounting treatment is correct. Check the underlying period and classification, not only whether two totals happen to match.

Practise contrasts rather than memorising a sign

Choose two questions from our Secondary POA papers: one involving an amount paid or received in advance and another involving an outstanding amount. For each, write a one-sentence reason for the adjustment. Then try a question with an opening balance, which requires tracking what already existed at the beginning.

Bring any unexplained difference to your teacher with the timeline and entries visible. That makes it easier to distinguish a reading error from a calculation error. Use older papers selectively and confirm the syllabus for your own examination year before relying on their scope or format.

Sources and further reading

Checked on 1 November 2026. The source question is real. The practical routines and explicitly labelled examples below are our original editorial guidance, not quotations or official marking schemes.

• For the 2026 value for both, do u add or subtract it? — 9 October 2026.
• SEAB O-Level POA syllabus 7087, 2026