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Zakat

Rust library for Islamic Zakat calculation. Uses rust_decimal for precision.

Features

• Gold, Silver, Business, Agriculture, Livestock, Mining & Rikaz
• Stocks, Mutual Funds, Crypto (as liquid assets)
• Professional Income (Gross/Net)
• Zakat Fitrah
• Configurable Nisab thresholds
• Portfolio aggregation (Dam' al-Amwal)
• Dynamic Portfolio (Add, Remove, Replace assets with stable UUIDs)
• Asset Labeling (e.g., "Main Store", "Crypto Wallet")
• Input Sanitization & Validation (Rejects negative values, ensures safe configuration)
• Flexible Configuration (Env Vars, JSON, Fluent API)
• Fiqh Compliance (Jewelry exemptions, Madhab-specific rules, Hawl requirements)
• Async Support (Optional integration with tokio and async-trait)
• Live Pricing Interface (e.g. for API integration)
• Detailed Reporting (Livestock in-kind details, calculation traces, metadata support)
• explain() Debugging (Get human-readable trace of calculations)
• Custom Strategies (Pluggable ZakatStrategy trait for custom rules)
• Full Serialization (Save/Load Portfolios via serde & JSON)

Install

With Async Support (Default):

[dependencies]

zakat = "0.9.0"

rust_decimal = "1.39"

tokio = { version = "1", features = ["full"] } # Required if using async features

Synchronous Only (Lighter weight):

[dependencies]

zakat = { version = "0.9.0", default-features = false }

rust_decimal = "1.39"

Usage

Business Zakat

Note: v0.7 continues to use the Fluent API introduced in v0.5. No more Builders!

use zakat::prelude::*;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let config = ZakatConfig::new()
        .with_gold_price(65)  // $65/g
        .with_silver_price(1); // $1/g

    // Fluent API: Infallible construction, chained setters
    // Newer "Semantic Constructor" (v0.7+) makes common cases even faster:
    let store = BusinessZakat::cash_only(10_000)
        .inventory(50_000)
        .label("Main Store");
        // .hawl(true) is default in cash_only(), so we can skip it if strictly satisfied

    // Validation & Calculation happens here
    let result = store.calculate_zakat(&config)?;

    if result.is_payable {
        println!("Zakat for {}: ${}", result.label.unwrap_or_default(), result.zakat_due);
    }
    
    // NEW: Get a human-readable trace of the calculation
    println!("{}", result.explain());
    
    Ok(())
}

Advanced Usage (Complex Scenarios)

For complex scenarios involving debts and receivables:

let assets = BusinessZakat::new()
    .cash(50000)
    .inventory(20000)
    .receivables(5000)
    .liabilities(1000)
    .debt(500) // Deductible immediate debt
    .label("Tech Startup")
    .hawl(true);

Portfolio Management

Handles multiple assets with "Dam' al-Amwal" (Wealth Aggregation) logic.

use zakat::prelude::*;
use zakat::portfolio::PortfolioStatus;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let config = ZakatConfig::new()
        .with_gold_price(65)
        .with_silver_price(1);

    let portfolio = ZakatPortfolio::new()
        .add(IncomeZakatCalculator::from_salary(5000)
            .label("Monthly Salary"))
        .add(PreciousMetals::gold(100)
            .label("Wife's Gold"))
        .add(InvestmentAssets::crypto(20000)
            .debt(2000)
            .label("Binance Portfolio"));

    let result = portfolio.calculate_total(&config);
    println!("Total Zakat Due: ${}", result.total_zakat_due);
    
    // Robust error handling for partial failures
    match result.status {
        PortfolioStatus::Complete => println!("All assets calculated successfully."),
        PortfolioStatus::Partial => {
            println!("Warning: Some assets failed calculation.");
            for failure in result.failures() {
                 println!("Failed item: {:?}", failure);
            }
        }
        PortfolioStatus::Failed => println!("Critical: All asset calculations failed."),
    }

    // Iterate successful details
    for detail in result.successes() {
        if let Some(label) = &detail.label {
            println!(" - {}: ${}", label, detail.zakat_due);
        }
    }
    Ok(())
}

Dynamic Portfolio Operations

New in v0.6: Manage assets dynamically using stable UUIDs.

use zakat::prelude::*;

fn main() {
    let mut portfolio = ZakatPortfolio::new();
    
    // Add returns the ID
    let (portfolio, id_1) = portfolio.add_with_id(
        BusinessZakat::new().cash(10_000).label("Branch A")
    );
    
    // Or push to mutable reference
    let mut portfolio = portfolio;
    let id_2 = portfolio.push(
        BusinessZakat::cash_only(5_000).label("Branch B")
    );
    
    // Replace an asset (e.g. updating values)
    portfolio.replace(id_1, BusinessZakat::new().cash(12_000).label("Branch A Updated")).unwrap();
    
    // Remove an asset
    portfolio.remove(id_2);
}

Async & Live Pricing (Optional)

Enable the async feature to use these capabilities.

use zakat::prelude::*;
use zakat::pricing::{PriceProvider, Prices};

struct MockApi;

#[cfg(feature = "async")]
#[async_trait::async_trait]
impl PriceProvider for MockApi {
    async fn get_prices(&self) -> Result<Prices, ZakatError> {
        // Simulate API call
        Ok(Prices::new(90.0, 1.2)?)
    }
}

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    #[cfg(feature = "async")]
    {
        let api = MockApi;
        // Initialize config from provider
        let config = ZakatConfig::from_provider(&api).await?;
        
        let portfolio = AsyncZakatPortfolio::new()
            .add(BusinessZakat::new()
                .cash(10_000));
                
        let result = portfolio.calculate_total_async(&config).await;
        println!("Total Due: {}", result.total_zakat_due);
    }
    Ok(())
}

Configuration

Flexible and safe configuration options.

use zakat::prelude::*;

// Load from Environment Variables (ZAKAT_GOLD_PRICE, etc.)
let config = ZakatConfig::from_env()?;

// Or load from JSON
let config = ZakatConfig::try_from_json("config.json")?;

// Or using Fluent API
let config = ZakatConfig::new()
    .with_gold_price(100)
    .with_silver_price(1)
    .with_madhab(Madhab::Hanafi);

// NEW (v0.7+): Quick Config Presets
let config = ZakatConfig::hanafi(100, 1); // Sets Madhab=Hanafi, Nisab=LowerOfTwo, Prices
let config = ZakatConfig::shafi(100);     // Sets Madhab=Shafi, Nisab=Gold, Prices

Custom Zakat Strategy (Advanced)

Create custom calculation rules beyond the standard Madhabs:

use zakat::prelude::*;
use std::sync::Arc;

#[derive(Debug)]
struct GregorianTaxStrategy;

impl ZakatStrategy for GregorianTaxStrategy {
    fn get_rules(&self) -> ZakatRules {
        // v0.7 allows fluent configuration with direct literals
        ZakatRules::default()
            .with_nisab_standard(NisabStandard::Gold)
            .with_trade_goods_rate(0.02577) // 2.577%
    }
    }
}

fn main() {
    // Use custom strategy with with_madhab() (accepts any impl ZakatStrategy)
    let config = ZakatConfig::new()
        .with_gold_price(100)
        .with_madhab(GregorianTaxStrategy);
    
    // Or share strategy across configs with Arc
    let shared = Arc::new(GregorianTaxStrategy);
    let config = ZakatConfig::new()
        .with_gold_price(100)
        .with_strategy(shared);
}

### Advanced Assets (Jewelry & Livestock)

```rust
use zakat::prelude::*;

// Personal Jewelry (Exempt in Shafi/Maliki, Payable in Hanafi)
let necklace = PreciousMetals::gold(100)
    .usage(JewelryUsage::PersonalUse)
    .label("Wife's Wedding Necklace");

// Livestock Reporting
let prices = LivestockPrices::new()
    .sheep_price(200)
    .cow_price(1500)
    .camel_price(3000);
    
let camels = LivestockAssets::new()
    .count(30)
    .animal_type(LivestockType::Camel)
    .prices(prices);

let result = camels.calculate_zakat(&config)?;

if result.is_payable {
    // Access detailed "in-kind" payment info
    if let crate::types::PaymentPayload::Livestock { description, .. } = result.payload {
        println!("Pay Due: {}", description);
        // Output: "Pay Due: 1 Bint Makhad"
    }
}

Modules

Migrating from v0.4 (Builder Pattern)

v0.5 removes all *Builder structs. Migration is straightforward:

- let assets = BusinessZakatBuilder::default()
-     .cash_on_hand(10_000)
-     .build()?;
+ let assets = BusinessZakat::new()
+     .cash(10_000);

Key changes:

• ::builder() → ::new() (now infallible, returns Self)
• .build()? → removed, object is ready immediately
• Validation errors now occur at .calculate_zakat() instead of .build()
• Errors include Asset Labels for better debugging

Contributing

1. Add tests
2. Use rust_decimal
3. If adding async features, ensure they are gated behind #[cfg(feature = "async")]
4. Run cargo test and cargo check --no-default-features

Support

"Those who spend their wealth in the cause of Allah..." — Al-Baqarah 2:262

License

MIT

Fiqh References & Compliance

We built this library with a deep respect for Islamic Jurisprudence (Fiqh), ensuring that every calculation isn't just mathematically correct, but religiously valid. Here is the breakdown of the scholarly sources (Dalil) and methodlologies we rely on.

1. Precious Metals (Gold & Silver)

For gold and silver, we adhere to the standard Nisab thresholds established in the Sunnah: 85 grams for Gold (20 Dinars) and 595 grams for Silver (200 Dirhams). This is based on the Hadith of Ali (ra) in Sunan Abu Dawud 1573 and Sahih Muslim 979.

What about Jewelry? This is a classic area of valid difference (Ikhtilaf). By default, we follow the Hanafi view (as found in Al-Hidayah) which regards personal jewelry as Zakatable wealth, citing the Hadith of the bracelets of fire (Sunan Abu Dawud 1558). However, we fully support the majority opinion (Shafi'i, Maliki, Hanbali) which treats permissible personal jewelry as exempt. You can easily toggle this in your configuration to match your Madhab.

2. Business Assets (Urud al-Tijarah)

All trade goods are valued at their current market price, not the cost price. This comes from the Prophet's (ﷺ) command to Samurah bin Jundub to pay Zakat on what is "prepared for sale" (Sunan Abu Dawud 1562).

Regarding debts: We deduct Immediate Liabilities (Dayn al-Hal) before calculation. This prevents you from paying Zakat on money that essentially belongs to your creditors, a principle supported by classical texts like Al-Mughni and modern standards like AAOIFI No. 35.

3. Agriculture (Zuru' wal-Thimar)

We handle the varying rates for crops based on how much effort goes into watering them:

• 10% (Ushr) for crops watered naturally by rain (Sahih Bukhari 1483).
• 5% (Half-Ushr) for strictly irrigated crops requiring cost and labor (Sahih Muslim 981).

For the Nisab (5 Awsuq), we use the standard conversion of approximately 653 kg (derived from Sahih Muslim 979), following the research of Dr. Yusuf Al-Qaradawi in his monumental work, Fiqh al-Zakah.

4. Livestock (An'am)

Our camel Zakat calculator is meticulously coded to follow the exact age tiers (like Bint Makhad, Bint Labun) outlined in the famous Letter of Abu Bakr (ra) preserved in Sahih Bukhari 1454.

Crucially, we enforce the Saimah condition: Zakat is only due if your livestock grazes freely on open pastures for the majority of the year. Feed-lot animals are generally exempt from this specific category.

5. Modern Assets & Portfolio

• Stocks & Crypto: We treat these as Trade Goods (Urud), subjecting them to a 2.5% rate on their market value, consistent with AAOIFI Standard 35.
• Professional Income: We support Dr. Al-Qaradawi's view on Zakat al-Mustafad, allowing you to calculate Zakat either on your Gross income (like a harvest) or Net income (after basic needs).
• The "Dam' al-Amwal" Principle: To ensure the computation is most beneficial for the poor (Anfa' lil-fuqara), we follow the Hanafi methodology of aggregating all your monetary assets (Gold, Silver, Cash, Stocks) into a single pot to check against the Nisab, rather than isolating them.