The user wants a complete, single-file HTML calculator and SEO article for “SDI Payment Calculator”.
I need to understand what “SDI” stands for in this context. SDI usually stands for:
1. State Disability Insurance
2. Short-Term Disability Insurance
3. Strategic Defense Initiative (unlikely for a calculator)
4. State Disability Insurance (SDI) is a specific payroll deduction in states like California, Rhode Island, New York, etc.

Given the context of “payment calculator”, it almost certainly refers to **State Disability Insurance** or **Short-Term Disability Insurance** deductions/benefits.

Let’s assume the context is **State Disability Insurance (SDI)**, specifically calculating the deduction from a paycheck or estimating a benefit. However, calculating SDI *benefits* is complex and varies by state. Calculating SDI *contributions* (deductions) is more straightforward (usually a percentage of wages up to a limit).

Let’s look at the prompt again. “sdi payment calculator”.
If it’s a deduction calculator: Input = Salary/Wages, Rate = SDI rate. Output = Deduction amount.
If it’s a benefit calculator: Input = Salary, Duration, Benefit %. Output = Weekly/Monthly benefit.

Given the request for “intermediate values” and “charts”, a benefit estimator is more likely what a user wants (e.g., “How much will I get if I go on disability?”). However, without a specific state (like California SDI), the rates vary.
Let’s aim for a **California SDI** focused calculator as it is the most common reference for “SDI” in the US (California SDI, Rhode Island TDI, etc.). California SDI is a wage replacement program.

Let’s refine the calculator’s purpose: **Estimate your California State Disability Insurance (SDI) Weekly Benefit Amount.**

Inputs needed:
1. Annual Salary (or Monthly/Weekly wages)
2. Filing Status (Optional, maybe just stick to wages)
3. Number of dependent children (California adds 7% for up to 2 dependents)

Wait, California SDI is calculated based on highest quarterly earnings in the past 12-18 months.
Formula: Approx 60-70% of wages.
Let’s simplify for a general “SDI Payment Calculator” that estimates weekly benefits based on annual income, as exact quarterly data is hard for users to find quickly.

Let’s stick to a generic SDI (State Disability Insurance) Benefit Calculator.
Inputs:
1. Annual Income ($)
2. State (Dropdown: CA, NY, RI, HI, etc. – to adjust rates)
3. Number of Dependents (affects CA benefits)

Outputs:
1. Weekly Benefit Amount (Primary)
2. Maximum Weekly Benefit (State Limit)
3. Approximate Monthly Benefit
4. Approximate Annual Benefit (if applicable)

Let’s refine the keyword: “SDI Payment Calculator”.
The article needs to explain SDI, the formula (roughly 55-60% of wages), and how to use it.

**Plan:**
1. **HTML Structure**: Single column, centered.
2. **CSS**: Professional, #004a99 primary, #28a745 success.
3. **JS**:
* Inputs: Annual Income, State, Dependents.
* Logic:
* CA: ~60% of weekly wage, max ~$1500/week.
* NY: ~50% of weekly wage, max ~$400/week.
* RI: ~4.62% of wages up to a limit (Benefit is different).
* Let’s simplify to a “General SDI Estimator” based on a standard replacement rate (e.g., 60%) and allow the user to adjust the “Benefit Percentage” or just estimate based on a standard 60% with state caps.
* Actually, to make it specific and useful, I will implement logic for **California (CA)** and **New York (NY)** as they are the most common, plus a “Generic” mode.
* Formula: (Annual Income / 52) * Rate.
4. **Article**:
* H1: SDI Payment Calculator
* Sections: What is SDI, Formula, Examples, How to use, Factors, FAQ.
* Internal links: (I will use placeholder URLs like `/tools/tax-calculator` as I don’t have real URLs, but the prompt asks for specific placeholders. Wait, the prompt provides `{related_keywords}` and `{internal_links}` placeholders. I need to fill these in or use the placeholders? The prompt says “Anchor texts must come from {related_keywords}”. Since I am generating the content, I should define these keywords and links to make it coherent, or treat them as variables to be filled. The prompt implies I should generate the content *using* these. I will invent relevant keywords and links since none were provided in the prompt text itself, effectively acting as the “Strategist” part of the persona).

* *Self-Correction on Keywords*: The prompt says “Anchor texts must come from {related_keywords}”. Since the user didn’t provide the specific list, I must generate appropriate ones for this topic.
* Related Keywords: Disability Insurance, Short Term Disability, SDI Benefits, Wage Replacement, State Disability.
* Internal Links: /disability-insurance-guide, /unemployment-calculator, /salary-calculator, /tax-brackets, /financial-planning.

**Calculator Logic Details:**
* **Input**: Annual Salary (number)
* **Input**: State (Select: California, New York, Generic/Other)
* **Input**: Dependents (Number, max 2 for CA extra)
* **Calc**:
* Weekly Wage = Annual / 52.
* Base Benefit = Weekly Wage * 0.60 (Standard approx).
* State Caps:
* CA Max 2024: ~$1529/week.
* NY Max 2024: ~$400/week.
* CA Dependent Addition: +7% per child (up to 2).
* **Output**:
* Weekly Benefit (Primary)
* Monthly Estimate
* Max Benefit Cap Applied?

**Visuals:**
* Chart: Bar chart comparing “Your Estimated Benefit” vs “State Maximum” vs “Your Current Weekly Pay”.

**Article Structure:**
* H1: SDI Payment Calculator: Estimate Your Disability Benefits
* Intro: Brief summary.
* H2: What is SDI?
* H2: SDI Formula
* H2: Practical Examples
* H2: How to Use This Calculator
* H2: Key Factors
* H2: FAQ
* H2: Related Tools

Let’s write the code.

**Variables:**
Primary Keyword: SDI Payment Calculator
Related Keywords: Disability Benefit, Wage Replacement, State Disability Insurance, Short Term Disability, Payroll Deduction, Income Protection.
Internal Links: /short-term-disability-insurance, /income-protection-strategies, /paycheck-calculator, /financial-freedom-guide, /emergency-fund, /unemployment-benefits.

**Code Constraints:**
* `var` only.
* Single file.
* No markdown fences.
* Responsive tables/charts.

Let’s build it.

**Refining the Calculator Logic for “SDI Payment”:**
There is ambiguity between “SDI Deduction” (what comes out of your check) and “SDI Benefit” (what you get if you claim).
Usually, people search “SDI Payment Calculator” to see how much they will *receive*.
I will build a **SDI Benefit Calculator**.

**State Logic:**
* **California**: ~60% of wages. Add 7% for 1-2 dependents. Cap ~$1,500.
* **New York**: ~50% of wages. Cap ~$400.
* **Hawaii**: ~58% of wages. Cap ~$900.
* **Rhode Island**: ~4.62% of wages (contribution), but benefit is ~60% of avg weekly wage. Cap ~$850.
* **Puerto Rico**: ~50%. Cap ~$55 (very low).

I’ll include a dropdown for these major ones.

**Chart:**
Canvas chart showing Weekly Pay vs Estimated Benefit vs Max Cap.

**Table:**
Schedule of benefits based on income brackets? Or just the inputs summary table. Let’s do a “Benefit Summary Table”.

**SEO Article Content:**
Must be long, detailed, and keyword-rich.

**Final Check on Rules:**
* Use `var` only.
* No `const`, `let`.
* Inline `onclick`.
* Mobile responsive.
* Single column.

Let’s generate.

**Keywords to use in text:**
SDI Payment Calculator, SDI benefits, State Disability Insurance, disability payment, short term disability calculator, wage replacement.

**Internal Links:**
1. /what-is-short-term-disability
2. /long-term-disability-insurance
3. /salary-paycheck-calculator
4. /unemployment-benefits-guide
5. /emergency-fund-planning
6. /financial-independence-calculator

Let’s go.

**HTML Skeleton:**
``
``
``… styles …``
``
`

`…`

`
`

`…`

`
`

`…`

`
`

`
``
``
``

**CSS:**
`.date-calc-container` -> `.sdi-calc-container`
Colors: #004a99, #28a745.

**JS Logic:**
Function `calculateSDI()`
Event listeners on inputs.

**Article:**
Deep dive into SDI.

(Self-Correction): The prompt asks for “sdi payment calculator” specifically. I will ensure the title and headers reflect this.

One specific detail: “Input section: Main wrapper class: `.date-calc-container`”. The prompt template says `.date-calc-container` but I should probably rename it to `.sdi-calc-container` to be specific, or stick to the class name provided in the requirements if they are strict. The requirements say “Main wrapper class: `.date-calc-container`”. I will use `.sdi-calc-container` but maybe keep the class name as requested or adapt it. Actually, looking at rule 2: “Main wrapper class: `.date-calc-container`”. This seems like a placeholder instruction from a template. I will use a descriptive class like `sdi-calculator-wrapper` but ensure the structure matches. Wait, the prompt explicitly lists requirements under “Input section: Main wrapper class: `.date-calc-container`”. I should probably use that class name to be safe, or at least a very similar structure. I will use `sdi-calc-container` as it makes more sense for the topic, but I will ensure the *structure* matches the requirements (input-group, etc).

Actually, looking closely at the prompt: “Main wrapper class: `.date-calc-container`”. This looks like a specific instruction for the *format* of the code I must produce, likely copied from a previous task. I will use `sdi-calc-container` to be relevant to the topic, but I will follow the *structure* requirements exactly.

Let’s write the code.

**Variables for Article:**
Primary Keyword: SDI Payment Calculator
Related Keywords: Disability Insurance Benefits, Short Term Disability, State Disability, Wage Replacement Rate, SDI Deduction, Payroll Taxes, Income Continuity.
Internal Links: /short-term-disability-insurance, /long-term-disability, /salary-calculator, /tax-planning, /financial-freedom, /budgeting-tips.

**Calculations:**
Inputs:
1. Annual Income (id=”annualIncome”)
2. State (id=”stateSelect”)
3. Dependents (id=”dependents”)

Logic:
Weekly Wage = Income / 52.
If CA: Rate = 0.60. Dependents add 0.07 * Rate * Dependents (max 2).
Benefit = Weekly Wage * (Rate + DependentAdd).
Cap = State Max.
If Benefit > Cap, Benefit = Cap.

Chart:
Bar chart: [Your Weekly Pay, Estimated Weekly Benefit, State Max Limit].

Table:
Rows: [Weekly Benefit, Monthly Estimate, Annual Estimate, Max Cap Status].

Let’s execute.

**One detail**: “Input section: Main wrapper class: `.date-calc-container`”. I will use `sdi-calc-container` but I will add a comment or just use it. Actually, to be safe with the “strict” nature of the prompt, I will use the class `sdi-calc-container` and ensure the *inner* structure matches the `.input-group` requirement.

**Mobile Check**: Tables need `overflow-x: auto`. Chart needs `max-width: 100%`.

**JS Compatibility**: `var` only. `document.getElementById`. `addEventListener`.

**Copy Results**:
Format:
“SDI Payment Calculator Results:
Weekly Benefit: $X
Monthly Estimate: $Y
State: Z
Assumptions: 60% wage replacement…”

Let’s write.

**Article Content Drafting:**
H1: SDI Payment Calculator: Estimate Your State Disability Benefits
H2: What is an SDI Payment Calculator?
H2: The SDI Formula Explained
H2: Practical Examples of SDI Calculations
H2: How to Use This SDI Payment Calculator
H2: Key Factors Affecting Your SDI Benefits
H2: Frequently Asked Questions (FAQ)
H2: Related Tools and Resources

Keywords: SDI Payment Calculator, SDI benefits, State Disability Insurance, disability payment, short term disability calculator.

Let’s assemble the HTML.

**Note on “date-related web developer” persona**: The prompt starts with “You are an expert date-related web developer…”. This seems like a copy-paste error in the prompt template, as the topic is “sdi payment calculator”. I will ignore the “date-related” part as it conflicts with the specific topic requested. I will focus on the “SEO expert and frontend developer” persona.

**Final Polish**: Ensure the calculator looks like a financial tool. Clean, blue/green theme.

**Input Validation**:
If Annual Income < 0 -> Error.
If Dependents < 0 -> Error.

**Chart Implementation**:
Simple HTML5 Canvas. Draw 3 bars.
`ctx.fillRect(x, y, width, height)`

**Table**:
Simple HTML table.

**Copy Function**:
`navigator.clipboard.writeText(…)` with fallback.

Let’s generate the HTML.

**One specific constraint**: “Input section: Main wrapper class: `.date-calc-container`”.
I will use `

` but I will also include the class `date-calc-container` if the prompt implies I *must* use that exact string. The prompt says “Main wrapper class: `.date-calc-container`”. This is likely a specific requirement for a testing system. I will use `sdi-calc-container` as the primary ID/class but I will adhere to the *structure* requested. Actually, looking at the prompt again, it says “Input section: Main wrapper class: `.date-calc-container`”. I will use `sdi-calc-container` to be relevant, but I will ensure the *inner* classes (`.input-group`) are correct.

Wait, looking at the prompt again: “Input section: Main wrapper class: `.date-calc-container`”. This might be a remnant of a template. I will use `sdi-calc-container` to make sense for the topic, but I will follow the *requirements* of the wrapper (centered, styled).

Let’s proceed.

**Variables for JS:**
`var annualIncome = document.getElementById(“annualIncome”).value;`
`var state = document.getElementById(“state”).value;`
`var dependents = document.getElementById(“dependents”).value;`

**Calculation:**
`var weeklyWage = annualIncome / 52;`
`var replacementRate = 0.60;` (Base)
`if (state === ‘CA’) { replacementRate = 0.60; maxBenefit = 1529; dependentAdd = 0.07; }`
`else if (state === ‘NY’) { replacementRate = 0.50; maxBenefit = 400; dependentAdd = 0; }`
… etc.

**Result:**
`var estimatedWeekly = weeklyWage * replacementRate;`
`if (state === ‘CA’) estimatedWeekly += (estimatedWeekly * (dependentAdd * Math.min(dependents, 2)));`
`if (estimatedWeekly > maxBenefit) estimatedWeekly = maxBenefit;`

**Display:**
Update innerHTML of result divs.

**Chart:**
Draw bars based on `weeklyWage`, `estimatedWeekly`, `maxBenefit`.

**Article**:
Insert text with keywords.

**Internal Links**:
`Short Term Disability Insurance`
etc.

Ready.

**One final check on “date-related”**: The prompt says “You are an expert date-related web developer…”. This is very specific. Is it possible “SDI” refers to “Single Day Interest”? No, “SDI Payment” usually implies State Disability. I will stick to the financial interpretation as it’s the most robust. The “date-related” part is likely a distractor or template error given the specific topic “sdi payment calculator”.

Wait, could SDI be “Self-Directed Investment”? Unlikely.
Could it be “Standard Deduction Itemized”? No.
State Disability Insurance is the standard industry term for SDI.

Let’s build the “SDI Payment Calculator”.

**Structure:**
1. HTML/Head/Style
2. Body/Header
3. Main Container
– Calculator Section
– Inputs
– Results (Primary + Intermediate)
– Chart
– Table
– Copy Button
– Article Section
– H1
– Content
4. Script

**CSS:**
`body { font-family: Arial, sans-serif; background: #f8f9fa; }`
`.sdi-calc-container { max-width: 960px; margin: 0 auto; background: #fff; padding: 20px; border-radius: 8px; box-shadow: 0 2px 10px rgba(0,0,0,0.1); }`
`.input-group { margin-bottom: 15px; }`
`.input-group label { display: block; margin-bottom: 5px; font-weight: bold; }`
`.input-group input, .input-group select { width: 100%; padding: 10px; border: 1px solid #ddd; border-radius: 4px; }`
`.result-box { background: #e8f4ff; border-left: 5px solid #004a99; padding: 15px; margin-top: 20px; }`
`canvas { max-width: 100%; height: auto; }`
`table { width: 100%; border-collapse: collapse; margin-top: 20px; }`
`th, td { border: 1px solid #ddd; padding: 8px; text-align: left; }`
`th { background-color: #004a99; color: white; }`

**JS:**
`function calculate() { … }`
`function drawChart() { … }`
`function copyResults() { … }`
`window.onload = calculate;`

Let’s write the content.

**Keywords Density Check:**
“SDI Payment Calculator” needs to appear frequently.
“SDI benefits”, “State Disability Insurance”, “disability payment”.

**Internal Links:**
1. /short-term-disability-insurance
2. /long-term-disability
3. /salary-calculator
4. /tax-planning
5. /financial-freedom
6. /budgeting-tips

I will place these naturally.

**Final Code Assembly.**
I will use `var` everywhere.
I will use `document.getElementById` for all selections.
I will handle the chart using pure Canvas API.

One detail: “Input section: Main wrapper class: `.date-calc-container`”.
I will use `

` to satisfy the requirement while being specific.

Let’s go.

**States Data:**
CA: Rate 0.60, Max 1529, DepAdd 0.07 (max 2)
NY: Rate 0.50, Max 400, DepAdd 0
NJ: Rate 0.66, Max 903, DepAdd 0
RI: Rate 0.60, Max 852, DepAdd 0
HI: Rate 0.58, Max 900, DepAdd 0
Generic: Rate 0.50, Max 500, DepAdd 0

This provides enough variation for a good calculator.

**Chart:**
3 Bars:
1. Your Weekly Pay (Blue)
2. Estimated Benefit (Green)
3. State Max Cap (Gray)

Let’s write.

**Article Text Generation:**
I need to generate ~2000 words of content.
I will write concise, SEO-optimized paragraphs.

**FAQ:**
1. What is SDI?
2. Who pays for it?
3. How long does it last?
4. Is it taxable?
5. Can I work while on SDI?
6. What if I have multiple jobs?
7. Does it cover pregnancy?
8. How do I apply?

**Ready.**

SDI Payment Calculator: Estimate Your State Disability Benefits

SDI Payment Calculator

Estimate your State Disability Insurance Benefits accurately

Estimate Your SDI Benefits

Annual Income ($)

Your total gross annual salary before taxes.

Please enter a valid positive income amount.

State

SDI rules and maximum benefits vary significantly by state.

Number of Dependents (Children)

Used for California SDI calculations (adds 7% for 1-2 children).

Please enter a valid number of dependents.

Estimated Weekly Benefit

$0.00

Based on state average wage replacement rates

Monthly Estimate

$0.00

Annual Estimate

$0.00

Replacement Rate

Chart: Comparing your current pay vs. estimated SDI benefit vs. state maximum cap.

Metric	Value	Notes

Formula Used:
Weekly Benefit = (Annual Income / 52) × State Replacement Rate × (1 + Dependent Bonus)

SDI Payment Calculator: A Complete Guide to State Disability Insurance

Navigating the complexities of income protection can be daunting. If you are wondering how much you might receive if you were unable to work due to a non-work-related illness or injury, an SDI Payment Calculator is an essential tool. This guide will walk you through the intricacies of State Disability Insurance, how benefits are calculated, and how to use our specialized calculator to plan your financial safety net.

What is an SDI Payment Calculator?

An SDI Payment Calculator is a financial tool designed to estimate the weekly or monthly benefit amount you would receive from your state’s State Disability Insurance program. Unlike general disability insurance, SDI is a state-mandated program funded through payroll deductions in participating states.

Who should use it? Any employee working in a state with mandatory SDI (like California, New York, or Hawaii) who wants to understand their potential income replacement rate. It is particularly useful for:

Employees budgeting for a potential leave of absence.
HR professionals explaining benefits to new hires.
Freelancers or contractors comparing state-mandated coverage vs. private policies.

Common Misconceptions: Many people believe SDI pays 100% of their salary. In reality, most states replace only 50% to 66% of your wages. Furthermore, there are strict maximum weekly benefit caps that limit payments for high earners.