📚 Accounting Principles and Financial Statements Basics | 会计学原理与财务报表基础
Accounting is the systematic process of recording, classifying, summarising, and interpreting business transactions. Financial statements are the final output of this process, giving owners, investors, and lenders a clear picture of a business's financial health.
会计是对企业交易进行系统记录、分类、汇总和解释的过程。财务报表是这个过程的最终产出，为业主、投资者和债权人提供关于企业财务状况的清晰图景。
1. The Purpose of Accounting | 会计的目的
The main purpose of accounting is to provide financial information that supports decision-making. Managers use accounting data to plan, control, and evaluate business operations, while external users use it to decide whether to invest, lend, or supply goods.
会计的主要目的是提供有助于决策的财务信息。管理者利用会计数据进行计划、控制和评价经营活动，而外部使用者则以此决定是否投资、放贷或供货。
There are two broad branches of accounting: financial accounting and management accounting. Financial accounting records past transactions and produces statutory reports such as the income statement and statement of financial position. Management accounting focuses on internal reports such as budgets and cost analyses.
会计可分为两大分支：财务会计与管理会计。财务会计记录过去的交易并编制法定报告，如损益表和财务状况表。管理会计则侧重于内部报告，如预算和成本分析。
- Record transactions accurately and completely | 准确、完整地记录交易
- Calculate profit or loss for a period | 计算一个期间的利润或亏损
- Show the financial position at a specific date | 反映某一特定日期的财务状况
- Help owners and managers monitor performance | 帮助业主和管理者监控业绩
2. The Accounting Equation | 会计恒等式
The accounting equation is the foundation of every financial statement. It states that everything a business owns, known as assets, must be financed either by the owner, known as capital or equity, or by borrowing, known as liabilities.
会计恒等式是每一份财务报表的基础。它表明企业拥有的一切，即资产，必须由所有者投入的资本或权益，或借入的负债来提供资金来源。
Assets = Capital + Liabilities
资产 = 资本 + 负债
This equation must always balance. If a business buys a delivery van for cash, total assets remain unchanged because one asset is exchanged for another. If a business borrows money from a bank, both assets and liabilities increase by the same amount.
这个等式必须始终成立。如果企业用现金购买一辆送货车，总资产不变，因为一种资产换成了另一种资产。如果企业从银行借款，资产和负债会同时增加相同的金额。
An expanded version includes income and expenses, which affect capital through profit or loss:
扩展形式包含收入和费用，它们通过利润或亏损影响资本：
Assets = Capital + Liabilities + Income − Expenses
资产 = 资本 + 负债 + 收入 − 费用
3. Double-Entry Bookkeeping | 复式记账法
Every financial transaction affects at least two accounts. Under the double-entry system, each transaction is recorded as a debit on one account and a credit on another account, and the total value of debits must always equal the total value of credits.
每一笔经济交易至少影响两个账户。在复式记账法下，每笔交易在一个账户中记借方，在另一个账户中记贷方，而且借方总额必须始终等于贷方总额。
To understand double-entry, remember the basic rule: assets and expenses increase with debits and decrease with credits; liabilities, capital, and income increase with credits and decrease with debits.
理解复式记账法的基本规则：资产和费用增加记借方、减少记贷方；负债、资本和收入增加记贷方、减少记借方。
| Transaction | Debit | Credit |
| Buy goods with cash | Purchases | Cash |
| Sell goods on credit | Trade receivables | Sales |
| Pay rent in cash | Rent expense | Cash |
| Receive cash from a customer | Cash | Trade receivables |
At the end of a period, businesses prepare a trial balance to test whether total debits equal total credits. If they do not, an error has been made. However, a balanced trial balance does not guarantee that no errors exist, because some errors affect two accounts equally.
期末，企业编制试算平衡表以检验借方总额是否等于贷方总额。如果不平衡，说明存在错误。然而，试算平衡表相等并不能保证没有错误，因为有些错误会同时影响两个账户。
4. Key Accounting Concepts | 重要会计概念
Financial statements are prepared using a set of assumptions and principles. These concepts make accounting information consistent, reliable, and comparable between businesses and over time.
财务报表依据一系列假设和原则编制。这些概念使会计信息具有一致性、可靠性，并能在不同企业之间以及不同时期之间进行比较。
- Going concern | 持续经营: The business is assumed to continue operating in the foreseeable future, so assets are recorded at cost rather than forced-sale value.
- Accruals concept | 应计制概念: Income and expenses are recognised when they are earned or incurred, not when cash is received or paid.
- Consistency concept | 一致性概念: The same accounting methods are used from one period to the next so that results can be compared.
- Prudence concept | 谨慎性概念: Gains are not recognised until they are certain, but losses are recognised as soon as they are probable.
- Business entity concept | 会计主体概念: The business is separate from its owner, so personal transactions are not recorded in business accounts.
- Historical cost concept | 历史成本概念: Assets are recorded at the amount originally paid rather than hypothetical current market value.
- Materiality concept | 重要性概念: Trivial items can be treated in the simplest practical way if omitting them does not mislead users.
5. The Income Statement | 损益表（利润表）
The income statement, also called the profit and loss account, measures financial performance over a period, usually one year. It shows whether the business has generated a net profit or a net loss.
损益表，也称为利润表，衡量企业在一个时期内（通常为一年）的经营成果，反映企业是实现了净利润还是净亏损。
The first part of the income statement calculates gross profit. Gross profit is the profit a business earns after subtracting the direct cost of goods sold from sales revenue.
损益表的第一部分计算毛利。毛利是销售收入减去直接销售成本后所赚取的利润。
Gross Profit = Revenue − Cost of Sales
毛利 = 收入 − 销售成本
Cost of sales includes the cost of purchasing or producing the goods sold. It is calculated as opening inventory plus purchases minus closing inventory.
销售成本包括购买或生产已售商品的成本，按“期初存货 + 本期购货 − 期末存货”计算。
Cost of Sales = Opening Inventory + Purchases − Closing Inventory
销售成本 = 期初存货 + 本期购货 − 期末存货
Operating expenses such as rent, wages, and insurance are then deducted from gross profit to arrive at profit for the year.
然后再从毛利中扣除租金、工资、保险费等经营费用，得出年度利润。
Net Profit = Gross Profit − Expenses
净利润 = 毛利 − 费用
6. The Statement of Financial Position | 财务状况表（资产负债表）
The statement of financial position, formerly known as the balance sheet, shows the financial position of a business at a particular moment in time. It lists assets, liabilities, and equity using the accounting equation.
财务状况表，以前称为资产负债表，反映企业在某一特定日期的财务状况，按照会计恒等式列示资产、负债和权益。
Non-current assets are long-term resources used for more than one year, such as property, plant, and equipment. Current assets are short-term resources, such as inventory, trade receivables, and cash. Current liabilities are debts due within one year, such as trade payables and bank overdrafts. Non-current liabilities are debts due after more than one year, such as bank loans.
非流动资产是使用超过一年的长期资源，如不动产、厂房和设备。流动资产是短期资源，如存货、应收账款和现金。流动负债是一年内到期的债务，如应付账款和银行透支。非流动负债是超过一年到期的债务，如银行贷款。
Assets = Equity + Liabilities
资产 = 权益 + 负债
Equity represents the owner's claim on the business. It increases with capital contributed and profit earned, and decreases with drawings and losses. The layout of the statement shows how assets are funded by equity and liabilities.
权益代表所有者对企业净资产的要求权。它因投入资本和赚取利润而增加，因提款和亏损而减少。资产负债表的布局反映了资产如何通过权益和负债来提供资金来源。
7. The Cash Flow Statement | 现金流量表
Profit is not the same as cash. A business can be highly profitable but still fail if it runs out of cash. The cash flow statement explains the movement of cash and cash equivalents during a period.
利润不等于现金。一家企业可能利润很高，但如果现金耗尽，仍然可能倒闭。现金流量表解释了在一个时期内现金及现金等价物的变动。
The cash flow statement is divided into three sections:
现金流量表通常分为三个部分：
- Operating activities | 经营活动: Cash generated from normal trading activities.
- Investing activities | 投资活动: Cash spent on non-current assets and cash received from their sale.
- Financing activities | 筹资活动: Cash from owners or lenders and cash paid as drawings or loan repayments.
A useful revision point is that the income statement is based on accruals, while the cash flow statement is based on actual cash movements. Depreciation is deducted in the income statement but does not involve cash, so it must be added back when calculating cash flow from operations.
一个重要的考点是：损益表采用应计制，而现金流量表基于实际现金流动。折旧在损益表中被扣除，但不涉及现金流出，因此计算经营活动现金流量时需要加回折旧。
8. Non-Current Assets and Depreciation | 非流动资产与折旧
Non-current assets provide benefits for several years, so their cost is spread over their useful life. This process of allocating cost is called depreciation. Depreciation is an expense in the income statement and reduces the carrying value of the asset in the statement of financial position.
非流动资产在多年内提供经济利益，因此其成本应在使用年限内分摊。这个过程称为折旧。折旧是损益表中的一项费用，同时减少资产在财务状况表中的账面价值。
The most common method is straight-line depreciation, which charges an equal amount each year.
最常用的方法是直线折旧法，即每年计提相同金额的折旧费用。
Annual Depreciation = (Cost − Residual Value) ÷ Useful Life
年折旧额 =（成本 − 残值）÷ 使用年限
Another method is the reducing balance method, which charges higher depreciation in the early years of the asset's life. It is calculated as a fixed percentage of the net book value at the beginning of each year.
另一种方法是余额递减法，在资产使用初期计提较高的折旧，按每年年初账面净值乘以固定折旧率计算。
Depreciation = Net Book Value × Depreciation Rate
折旧额 = 账面净值 × 折旧率
9. Inventory Valuation | 存货计价
Inventory value affects both cost of sales and the value of closing inventory on the statement of financial position. Different valuation methods can lead to different profit figures and asset values.
存货价值同时影响损益表中的销售成本和财务状况表中的期末存货价值。不同的计价方法会导致不同的利润数字和资产价值。
Three common methods are FIFO, LIFO, and weighted average cost. FIFO assumes that the oldest items are sold first. LIFO assumes that the newest items are sold first, but LIFO is not allowed under IFRS. The weighted average method calculates a new average cost after each purchase.
三种常见方法是先进先出法（FIFO）、后进先出法（LIFO）和加权平均法。先进先出法假设最旧的存货先卖出；后进先出法假设最新的存货先卖出，但在国际财务报告准则（IFRS）下不允许使用；加权平均法则在每次购货后计算新的平均成本。
| Method | Effect when prices rise |
| FIFO | Lower cost of sales, higher profit, higher closing inventory. |
| AVCO | Mid-range cost of sales, profit, and inventory value. |
| LIFO | Higher cost of sales, lower profit, lower closing inventory. |
10. Ratio Analysis: Profitability and Liquidity | 比率分析：盈利性与流动性
Financial statements alone are not enough; managers and investors use ratios to evaluate performance. Ratios help compare results with previous years or with competitors.
仅看财务报表是不够的，管理者和投资者使用比率来评价业绩。比率有助于与往年或竞争对手进行比较。
Profitability ratios measure how efficiently a business converts sales into profit. Liquidity ratios measure the ability of a business to meet its short-term debts as they fall due.
盈利性比率衡量企业将销售转化为利润的效率；流动性比率衡量企业偿还短期到期债务的能力。
| Ratio | Formula |
| Gross profit margin | Gross Profit ÷ Revenue × 100 |
| Net profit margin | Net Profit ÷ Revenue × 100 |
| Current ratio | Current Assets ÷ Current Liabilities |
| Acid test ratio | (Current Assets − Inventory) ÷ Current Liabilities |
A current ratio of about 1.5 to 2 is generally considered healthy, but the ideal level depends on the industry. If the acid test ratio is much lower than the current ratio, the business may be holding too much inventory.
流动比率一般认为在1.5至2左右较为健康，但理想水平取决于行业性质。如果速动比率远低于流动比率，说明企业可能持有过多存货。
11. Control Accounts and Common Errors | 控制账户与常见错误
Control accounts summarise all transactions recorded in the sales ledger and purchases ledger. The sales ledger control account contains the total amount due from credit customers, while the purchases ledger control account contains the total amount owed to suppliers.
控制账户汇总了销售分类账和购货分类账中的所有交易。销售分类账控制账户反映赊销客户欠款总额，购货分类账控制账户反映欠供应商的款项总额。
At the end of the period, the balance on the control account should equal the total of the individual customer or supplier balances. If they do not match, the accounting records contain errors.
期末，控制账户余额应等于所有个别客户或供应商余额的合计。如果不等，说明会计记录存在错误。
Common errors can be identified by their effect on the trial balance:
常见错误可通过其对试算平衡表的影响来识别：
- Error of omission: a transaction is completely missed.
- Error of commission: a transaction is posted to the wrong person's account.
- Error of principle: a transaction is posted to the wrong class of account.
- Error of original entry: the correct accounts are used but the wrong amount is entered.
中文对应如下：
- 遗漏错误：交易完全未被记录。
- 记账对象错误：交易记入错误的客户或供应商账户。
- 记账原理错误：交易记入错误的账户类别。
- 原始记录错误：账户正确，但入账金额错误。
12. Revision Summary | 复习总结
To master this topic, focus on the core relationships rather than memorising every figure. Remember that the accounting equation must always balance, double-entry requires equal debits and credits, and the income statement and statement of financial position answer two different questions: how well has the business performed, and what does the business own and owe?
要掌握这个考点，应关注核心关系，而不是死记每个数字。记住会计恒等式必须始终平衡，复式记账要求借贷相等，损益表与财务状况表回答两个不同的问题：企业经营业绩如何？企业拥有什么、欠什么？
Also remember that profit is not cash, depreciation is a non-cash expense, and inventory valuation affects both profit and asset value. These distinctions are frequent exam traps.
同时要记住：利润不是现金，折旧是非现金费用，存货计价同时影响利润和资产价值。这些都是考试中常见的陷阱。
| Key idea | Formula or rule |
| Accounting equation | Assets = Capital + Liabilities |
| Double-entry | Debits = Credits |
| Gross profit | Revenue − Cost of Sales |
| Net profit | Gross Profit − Expenses |
| Cost of sales | Opening Inventory + Purchases − Closing Inventory |
| Straight-line depreciation | (Cost − Residual Value) ÷ Useful Life |
By linking these ideas to real business examples, you will be ready to interpret financial statements and answer exam questions with confidence.
把这些概念与实际商业案例联系起来，你将能够自信地解读财务报表并回答考试题目。
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