Navigating Q3 Bookkeeping for a Stress-Free Quarter
- J&J Korea
- Sep 18
- 4 min read
Updated: Sep 19
The end of the fiscal year is often a critical time to review the books of your company. However, the third quarter, or Q3, spanning July to September, provides a window to review your books before preparing for year-end closing. In fact, it is the time to identify and fix any possible bookkeeping mistakes before they spiral into major ones in the second half of the year.
Let’s walk through this Q3 bookkeeping guide for individual and corporate businesses.
Understanding the Strategic Importance of Q3 Bookkeeping

Q3 bookkeeping is an important practice to review your financial journey till the halfway mark of the year. It plays a key role in various aspects such as:
Tax Burden Prediction:
Reviewing your Q3 financials lets you project your tax burden for the entire year. Youget a realistic estimate of your final tax liability and plan accordingly.
Interim Tax Preparation:
Q3 financials are directly related to the interim prepayment of corporate income tax. Maintaining accurate records during this time ensures that these prepayments are correctly calculated, lowering the risk of penalties or unexpected tax bills.
Early Error Correction:
As we mentioned earlier, you have the opportunity to identify errors in transaction processing, documentation, or overlooked expenses. Resolving these issues at that time is less complicated and costly than waiting until the year-end audit or a National Tax Service (NTS) review.
Q3 Bookkeeping Checklist for Individual Business Owners

Also known as sole proprietors or small businesses, individual business owners in South Korea have unique bookkeeping needs. Keeping things in mind, here is a detailed checklist to guide them on the Q3 review.
Revenue and Expense Organization
Utilize the Hometax (홈택스) platform to assess the automatically collected data, such as e-tax invoices, credit card sales, and cash receipts. Make sure that all transactions are accurately recorded and categorized.
Manual Records:
It is also important to consider the transactions that are not automatically logged. Some of the common examples of these transactions are bank transfer sales, cash sales, and other manual payments. Make sure to maintain a separate, detailed record of these items so that everything is captured and categorized.
Vendor-Based Expense Sorting:
To identify the key spending patterns, you can organize your expense data by vendor. It also keeps the process of managing year-end expense documentation streamlined.
Key Expense Processing Points
From tax invoices to credit card receipts and cash receipts, make sure that you have secured the appropriate documentation for all business expenses.
Record the easily overlooked items, such as cash sales or bank transfer sales.
Organize expense data by vendor to make year-end expense documentation easier.
Inventory Management Methods
Your taxes are directly impacted by ending inventory. That's why you should avoid overstating or understating this figure. An inflated value can raise a tax bill, while a deflated one can lead to an audit. Also, use tools or software like Excel or Enterprise Resource Planning to manage inventory quantities and unit costs. Make sure you have proof for any inventory that is lost or discarded.
VAT Reporting Linkages
Take a proactive step by compiling revenue and expense details for the second half VAT final report in advance to prevent a last-minute scramble and ensure accuracy. It is also important to check your eligibility for tax credits, such as the credit card sales slip issuance tax credit.
Q3 Bookkeeping Checklist for Corporations

The bookkeeping needs of any corporation are different from those of its individual counterpart. It requires taking a deeper look into the financial health of the business beyond simple expenses and revenue.
Preparing the Income Statement
First of all, review the cumulative profit and loss up to Q3. It lets you check trends in your operating and net profit margins, which are key indicators of business performance. You can use this data as a primary reference for management decisions.
Organizing the Statement of Financial Position
Perform a detailed assessment of your assets. Clear up assets that are unlikely to be realized, such as accounts receivable and accrued income. Make sure there are no omissions in short-term borrowings or accounts payable.
Excessive representative’s temporary payments may trigger deemed interest income and could limit deductible expenses. They also weaken the company’s financial position for creditworthiness.
Calculating Estimated Corporate Tax
A tax simulation should be performed based on your third-quarter profit and loss. This helps you learn the difference between interim and year-end tax payments, which in turn helps with cash flow and preparing for tax obligations. Check your eligibility for tax credits like those for R&D expenses, as they can significantly reduce your tax burden. Finally, align these tax calculations with your future business plan, such as when it comes to paying out dividends or bonuses, to create a smart and efficient overall tax strategy.
Tax Adjustment Preparation
When it comes to handling business expenses for tax purposes, keep in mind that certain costs should be addressed carefully. For instance, there are strict limits imposed on certain deductions for entertainment expenses, and the right documents are required to prove them.
The depreciation calculations should follow South Korean tax laws, as you may need to make adjustments to get the most tax benefit. Make sure to keep employee welfare expenses separate from the company's personal expenses, as only the former can be deducted.
The Bottom Line:
A thorough quarterly financial review is an important part of robust business management in South Korea. As you follow this Q3 bookkeeping guide, you can not only fulfill legal obligations but also gain insights into your business’s financial health.
With proactive management, you can learn about tax liabilities, optimize y our finances, and tread on a seamless path toward a successful year-end closing. To know more about Q3 bookkeeping and other aspects of taxation, you can reach out to us at J&J Korea.
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