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回收期 = 初始投资 ÷ 年净现金流入 = 50,000 ÷ 20,000 = 2.5年。回收期忽略货币时间价值和回收后的现金流；它作为资本支出的快速流动性风险筛选工具。

估计总额 = 50,000 + 45,000 + 25,000 = 120,000美元。实际总额 = 55,000 + 48,000 + 22,000 = 125,000美元。差异 = 实际 − 估计 = 125,000 − 120,000 = 超支5,000美元，属不利差异。人工和材料超支抵消并超过了设备节约。

依 IRC §3301，FUTA 的法定税率是每名工人前 $7,000 工资的 6.0%，但只要雇主所在州按时缴纳 SUI，即可依 §3302 享受 5.4% 的抵免，实际只剩 0.6%，即每人每年 $42。加州新雇主的 SUI 税率是同样前 $7,000 的 3.4%，已有经验费率的雇主大致在 1.5% 到 6.2% 之间——其他选项里那些 1.5% 和 6.2% 正是从这个区间借来的。加州的失业保险计税基数没有 $14,000 这一档，而 6.0% 是抵免之前的 FUTA 税率，不是抵免之后。

IRC §6654(c)(2) 把个人预缴税的分期日定为4月15日、6月15日、9月15日和次年1月15日；遇周末或节假日则顺延至下一个工作日。各期间隔是故意不均等的——三个月、两个月、三个月、再四个月——这也正是这个规律值得背下来的原因。3月和12月的15日属于公司的分期日；每月1日那一组与任何联邦时间表都不对应；从1月开始则把每一个日期都挪错了季度。

根据 IRC §6041/§6041A（加州 Rev. & Tax Code §18631 与之对应），向非公司形式收款方支付的服务费一旦达到年度门槛，就必须用 1099-NEC 表申报；2026 税务年度的门槛是 $2,000，由长期沿用的 $600 上调而来，因此 $3,400 必须申报（c）。(a) 错在 CSLB 发证与联邦或州的信息申报毫无关系；一般只有向公司（法律、医疗类除外）的付款才获豁免。(b) 理由对但表格错：自 2020 税务年度起，非雇员报酬已从 1099-MISC 第 7 栏移出，改用 1099-NEC。(d) 是给雇员用的；分包商不在工资册上，不会收到 W-2。

B&P §7071.17(a) 规定，在核发、续期、恢复或重新启用执照之前，委员会必须要求申请人缴存一份足以担保支付相当于未清偿最终判决金额的保证金；申请人有90天时间缴存，该保证金至少保留一年，也可以改为提交与判决债权人达成的经公证的清偿协议。它是在承包商保证金之外另加的。再缴一份执照保证金并未为该判决本身提供担保，而且 §7071.11(b) 规定在超出保证金金额的判决未获清偿期间不得续期。$5,000 押金这一选项并不存在，担保释放函只是状态证明，不是担保。

投标担保（通常是投标保证金）保护发包方，以防表面上的最低价投标人在中标后拒绝签署合同、或拒绝提交《公共合同法》第10221条要求的履约保证金和付款保证金；此时担保公司支付保证金额与该投标和次低可接受投标之差额中的较小者。向分包商和供应商付款是《民法》第9550条付款保证金的承诺。按期完工是履约保证金的承诺。工艺缺陷由合同的保修条款处理，而不是由随标提交的保证金处理。

B&P §7159.5(a)(3) 把家庭装修合同的预付款上限定为 $1,000 或合同金额的10%，以较低者为准；因此在一份 $60,000 的工程上，上限是 $1,000 而不是 $6,000。随后 §7159.5(a)(5) 禁止索取或收受任何超过已完成工作价值或已交付材料价值的后续款项。像10%和20%那两项一样去掉美元上限，正是该法条在大额合同上要防止的错误。$5,000 与25%这两个数字在加州任何合同类型中都不存在。

Bus. & Prof. Code §7159.5为住宅游泳池合同设定了更严格的特殊规则：预付款不得超过$200，余款必须按与游泳池实际施工阶段（如开挖、钢筋、管道、喷浆、铺面、抹面）相匹配的节点进度付款。选项A中的$1,000/10%规则适用于§7159下的一般家庭装修——游泳池有其自身更严格的规则。20%和$5,000的选项会违反消费者保护要求，是CSLB纪律处分的常见诱因。

执照保证金是一笔固定的资金池：追偿不得超过其 $25,000 的罚金金额，而 B&P §7071.11(a) 规定，若保证金不足以全额清偿所有索赔，则按各索赔人索赔金额的比例分配。既没有优先顺序，也没有消费者欺诈分项上限；唯一的类别上限是担保人对工资和附加福利类索赔的累计责任不超过 $4,000。保证金也不是为判决补足的次级担保。加州并没有面向一般消费者索赔的 CSLB 回收基金，但 §7071.11(b) 规定未清偿余额存在期间不得续期，消费者仍可向承包商本人追索该余额。

B&P §7071.11(a) 只有一句话：保证金不足以全额支付所有索赔时，「保证金金额应按各索赔人索赔额的比例分配给所有索赔人」。没有优先顺序——业主、未获付款的木工和材料商，都按同一比例拿回各自应得的部分（a）。(d) 是陷阱，而且很像真的，因为该条确实单独提到过工资一次：保证人对本保证金上工资与附加福利索赔的**总额**责任上限为 $4,000。那是对某一类索赔设的天花板，不是让它插队。(b) 把保证金的目的弄反了，保证金是为索赔人存在的，不是为保证人或委员会。(c) 是不动产权益登记的规则，不是保证金分配的规则。

B&P §7071.12 允许持照人以现金、本票或指定证券按其所替代保证金的全额缴存，且必须存入州财政官处；该存款按与担保保证金相同的规则应对索赔，若不足以全额清偿，则依 §7071.11(a) 按比例分配。法条中没有杠杆比率，因此 $5,000 的存款担保不了任何金额。也不存在部分替代：不能用现金与担保保证金拼凑出所需数额。私人银行的托管账户即使有存款保险，也不是向州财政官缴存。

RMO 是持照实体的主管人员；RME 则是该实体长期雇用的真正员工，而 16 CCR §823 要求非真正所有人的合格人员每周至少32小时、或企业营业总时数的80%（以较少者为准）实施直接监督与控制。持股10%以上恰恰是免除该工时要求的条件，因此那一项描述的是豁免情形而非 RME 本身。§7068.1 中根本没有亲属关系的要求。执照类别取决于该实体所取得的资质，而不是 RME 个人必须持有的执照。

错误分类会叠加两类责任。税务一侧是 IRC §3402 与 §3111 项下的联邦所得税预扣和雇主、雇员两部分 FICA，§3301 项下的 FUTA，以及通过 EDD 缴纳的加州 PIT、SDI 与 UI；只有在并非故意时才能适用 IRC §3509 的降低税率。劳动一侧是《劳工法》§226.8 每次故意违规 $5,000 至 $15,000、构成惯常做法时 $10,000 至 $25,000 的罚款，外加 §226(e) 的工资单罚款和无保险雇主的工伤赔偿风险。签署确认书毫无作用，因为《劳工法》§2775(a) 明确不理会当事人所用的名义。信息申报罚款与上述数额相比只是零头。

加州民法典 §8811 由 SB 61 新增，适用于 2026 年 1 月 1 日当日或之后订立的合同，将私人工程的留置金上限定为 5%——既是每笔付款的 5%，也是合同总价的 5%——并且适用于每一层级：业主对总承包商、总承包商对分包商，以及再往下（b）。「范围狭窄」指的两项例外是：非混合用途且不超过四层的住宅项目；以及在投标时或之前已收到书面通知、却未能提供由核准保险人出具的履约及付款保证金的分包商。为执行该条提起诉讼的胜诉方可获判律师费。(a) 说的是 2026 年之前的法律状态，那时私人工程的留置金确实纯属合同约定。(c) 正是该法要终结的 10% 惯例；如今它只在上述两项例外之内、以及 2026 年之前签订的合同上继续存在。(d) 数字对但范围错——公共合同法典 §7201 多年来已将多数州与地方公共工程限制在 5%，而 §8811 把同一上限延伸到了私人工程。

B&P §7071.6 经 SB 607 修订，自2023年1月1日起把承包商执照保证金从 $15,000 提高到 $25,000，§7071.9 项下的合格个人保证金同时提高到 $25,000；§7071.6.5 项下的 LLC 员工与工人保证金为 $100,000。$15,000 与 $12,500 都是2023年之前的数额，其中 $12,500 是2016年之前的水平。没有任何执照类别的保证金是 $50,000。

B&P §7071.9 规定，只要 RMO 或 RME 不是持照实体至少10%的真正所有人，就必须另行缴存 $25,000 的合格个人保证金：没有实际股权的合格人员在监督失职时损失有限，该保证金为公众提供第二条追偿途径。员工人数与 §7071.9 无关。持有多个分类改变的是可承接的工作范围，而不是保证金要求。自行承保工伤赔偿是《劳工法》§3700 另设的程序，有其自身的担保要求。

Markup is calculated on cost. $8,000 x 25% = $2,000 markup. Price = $8,000 + $2,000 = $10,000. (Note: a 25% markup is NOT the same as a 25% margin; a 25% margin would produce a price of $8,000 / 0.75 = $10,666.)

Gross profit = $15,000 - $12,000 = $3,000. Margin is profit divided by SELLING price: $3,000 / $15,000 = 0.20 = 20%. (The markup, by contrast, would be $3,000 / $12,000 = 25%.)

For a target margin, divide cost by (1 - margin). Selling price = $6,000 / (1 - 0.40) = $6,000 / 0.60 = $10,000. Check: profit = $10,000 - $6,000 = $4,000, and $4,000 / $10,000 = 40% margin. Marking up 40% on cost ($8,400) would give only a 28.6% margin, a common and costly error.

Take cost = $100. A 50% markup adds $50, giving a price of $150. Margin = profit / price = $50 / $150 = 33.3%. Markup and margin are different: markup is on cost, margin is on price.

Markup = profit / cost. Profit = $20,000 - $16,000 = $4,000. Markup = $4,000 / $16,000 = 0.25 = 25%. (The margin on price would be $4,000 / $20,000 = 20%.)

The markup that yields a given margin = margin / (1 - margin). Here 0.30 / 0.70 = 0.4286 = 42.9%. Check with cost $100: 42.9% markup gives price $142.90; margin = $42.90 / $142.90 = 30%.

$2,000 x 35% = $700 markup. Price = $2,000 + $700 = $2,700. Markup is added to cost.

Margin states profit as a percentage of the selling PRICE; markup states the same dollar profit as a percentage of COST. Because price is the larger base, margin is always the smaller percentage, which is why the first option has it backwards. The third option swaps the bases outright. The fourth would hold only if cost equalled price, which would mean no profit at all.

Margin 20% means profit is 20% of the $50,000 price = $10,000. Costs = price - profit = $50,000 - $10,000 = $40,000.

100% markup doubles cost: price = $3,000 + $3,000 = $6,000. Margin = profit / price = $3,000 / $6,000 = 50%. A 100% markup always equals a 50% margin.

Overhead recovery rate = annual overhead / annual direct costs = $120,000 / $600,000 = 0.20 = 20%. He adds 20% of each job's direct cost to cover overhead, then adds profit on top.

Overhead consists of indirect costs that keep the business running but are not tied to one specific job, such as office rent, administrative salaries, insurance, and utilities. Materials, on-site labor, and subcontractors are direct costs charged to a particular job.

Direct cost $10,000 + 15% overhead ($1,500) = $11,500 subtotal. Then 10% profit on $11,500 = $1,150. Final price = $11,500 + $1,150 = $12,650. Order matters: overhead first, then profit on the total.

Overhead is the indirect, ongoing cost of running the business — rent, office wages, insurance, trucks, licences — which cannot be billed to any single job and must be recovered across all of them through markup. Costs that scale with the job are direct costs, and materials and labour for a job are the clearest example of direct cost. What is left after every cost is paid is net profit, which comes after overhead rather than being it.

Net profit = revenue - direct costs - overhead = $800,000 - $560,000 - $160,000 = $80,000. Net profit margin = $80,000 / $800,000 = 10%.

When the overhead rate built into the markup is too low, every bid is priced below the true cost of doing business: the job can show a profit on its own sheet while the company loses money once real overhead is paid. Bidding high is the result of the opposite error, over-recovering overhead. Lower taxes follow a lower profit but are a symptom, not the harm. And subcontractors price their own overhead into their own numbers; nothing shifts the general contractor's overhead onto them.

Break-even revenue = fixed costs / contribution margin ratio = $90,000 / 0.30 = $300,000. At $300,000 revenue, the 30% contribution margin ($90,000) exactly covers fixed costs, leaving zero profit.

Break-even units = fixed costs / contribution margin per job = $60,000 / $2,000 = 30 jobs. Below 30 jobs he loses money; above 30 he earns profit.

Break-even is the sales volume at which total revenue equals total costs, fixed and variable together, so the result is neither profit nor loss. Covering overhead alone is not break-even, because direct job costs still have to be paid. Variable costs equalling fixed costs is an arbitrary coincidence with no meaning for profit. Maximum profit is a different point entirely, and it lies well above break-even.

Required revenue = (fixed costs + target profit) / contribution margin ratio = ($100,000 + $50,000) / 0.25 = $150,000 / 0.25 = $600,000.

Break-even revenue = fixed costs / contribution margin ratio. Raising the numerator (fixed costs) while holding the ratio constant increases the break-even sales volume: he must sell more just to cover the higher fixed costs.

Materials are 3,200 x $0.85 = $2,720 and labour is 40 x $45 = $1,800, so the direct cost is $4,520. $3,920 comes from pricing the labour at $30 an hour instead of $45. $4,840 comes from reading the lumber at $0.95 a board foot. $2,720 is the materials alone, with the labour line left out of the estimate.

Overrun = (actual - estimate) / estimate = (150 - 120) / 120 = 30 / 120 = 0.25 = 25%. Job costing compares estimated to actual to reveal a 25% labor overrun.

Job costing records the labour, material, subcontract and equipment cost actually incurred on each project and sets it beside the estimate, so the contractor learns which jobs made money and bids the next one better. Spreading overhead is what the overhead rate does, and it is an input to the bid rather than the purpose of job costing. Sales tax is computed from purchase invoices. And an hourly price for the next job is guesswork unless the job history behind it has been costed.

Volume in cubic feet = 30 x 40 x (4/12) = 30 x 40 x 0.333 = 400 cubic feet. Convert to cubic yards: 400 / 27 = 14.8 cubic yards.

Burden adds 35% to the base wage: $28 x 1.35 = $37.80 per hour. Estimators must use the fully burdened rate, not the base wage, or labor will be underestimated.

One coat: 2,400 / 350 = 6.86, round up to 7 gallons. Two coats need 2 x 6.86 = 13.7, round up to 14 gallons. Always round up when buying whole cans.

Markup = $18,000 x 12% = $2,160. Amount billed = $18,000 + $2,160 = $20,160. The general marks up subcontracts to cover coordination, supervision, and risk.

A contingency is money set aside inside the estimate to absorb unforeseen site conditions and the normal imprecision of estimating, so a small surprise does not have to become a claim. It is not profit: spending it leaves the margin intact, while treating it as profit means pricing the risk twice. Retention is the owner's money withheld from payments - five percent on public works under Public Contract Code section 7201, and capped at five percent on private contracts entered into on or after 1 January 2026 by Civil Code section 8811 - so it is money not yet received rather than a cost to fund. And owner-requested changes are paid through change orders at agreed prices, which is why they sit outside the contingency.

Working capital is current assets minus current liabilities, the short-term money actually available to run the business. Total assets minus total liabilities is owner's equity, which measures net worth rather than liquidity. Revenue minus operating expenses is operating profit, a period result rather than a balance. And cash minus payables ignores receivables, inventory and the rest of the current accounts, so it understates what is on hand to work with.

Working capital = current assets - current liabilities = $150,000 - $90,000 = $60,000. This is the cash cushion available for short-term obligations.

The structural cause is timing: wages and material invoices fall due weeks before the owner pays a progress billing, and retention delays part of the receipt further still, so cash drains even on a profitable job. Taking an early-payment discount does consume cash, but it buys a return and is a choice rather than the cause. Monthly billing lengthens the gap and makes the problem worse, without being its origin. Withholding retention from subs conserves the contractor's cash rather than draining it.

Accrual accounting books revenue when it is earned, but wages, suppliers and taxes must be paid in cash immediately, and money sitting in receivables, retention and work in progress is not available to spend. Double-recording revenue would be an error, not a reason. Depreciation is the opposite case: it reduces book profit without any cash leaving the bank. And retention is recorded as a receivable, an asset still owed, which is precisely why profit can look healthy while the bank balance does not.