Quasi single entry system (also called partly single entry system) is a form of single-entry bookkeeping in which, besides cash and personal accounts, some important subsidiary books (like sales and purchases) are also maintained.

Quick Scoop: Core Idea

Think of it as a hybrid between pure single entry and full double entry.

You still don’t record every aspect of each transaction like in double entry, but you do keep more than just a cash book and a few personal accounts.

In a quasi single entry system, a small business might keep:

  • Personal accounts of debtors and creditors
  • Cash book
  • Subsidiary books, such as:
    • Sales book
    • Purchases book
    • Bills receivable/payable book

Because these extra books exist, the records are less incomplete than in simple or pure single entry and can act as a practical substitute for a full double-entry system for very small entities.

Mini Breakdown: Types Context

Within single-entry systems, quasi single entry is usually listed as one of three main types:

  1. Pure single entry – Only personal accounts are kept; no cash book, no sales or purchases records.
  1. Simple single entry – Personal accounts plus a cash book are maintained.
  1. Quasi single entry – Personal accounts, cash book, and subsidiary books (sales, purchases, bills, etc.) are all maintained.

So, what is quasi single entry system in one line?

It is a partly single-entry system in which cash, personal, and some subsidiary books are maintained, making it a practical alternative to full double-entry for small businesses.

Why People Use It Today

Even now, in 2026, small and very small businesses or sole proprietors sometimes prefer this approach when:

  • They want more detail than a bare-bones cash book.
  • They cannot afford full double-entry software or professional accountants.
  • They need enough records to estimate profit, track credit customers and suppliers, and prepare a basic statement of affairs.

It fits into current “lightweight bookkeeping” trends where simplicity and low cost matter more than full formal compliance, especially in micro-businesses and informal sectors.

Tiny Story-Style Example

Imagine a small neighborhood shop:

  • The owner records all cash in and cash out in a cash book.
  • They also maintain:
    • A sales book for credit sales to regular customers.
    • A purchases book for credit purchases from suppliers.
    • Personal ledgers for each customer and supplier.

However, they do not prepare full double-entry ledgers for every kind of account (like full expense, revenue, and capital accounts).
This shop is effectively using a quasi single entry system —more than basic single entry, but not a complete double-entry setup.

Quick Pros and Cons

Advantages

  • More reliable than pure/simple single entry.
  • Easier and cheaper than full double entry.
  • Gives enough data for approximate profit and financial position.

Limitations

  • Still not fully accurate or comprehensive like double entry.
  • Harder to detect all errors or fraud.
  • May not satisfy strict audit or regulatory requirements.

Bottom line:
A quasi single entry system is a partly complete , practical bookkeeping method where cash, personal, and key subsidiary books are maintained, offering a middle path between very basic single entry and full double-entry accounting.

Information gathered from public forums or data available on the internet and portrayed here.