diff --git a/src/commands/db/insert.rs b/src/commands/db/insert.rs
new file mode 100644
index 0000000..84f87ea
--- /dev/null
+++ b/src/commands/db/insert.rs
@@ -0,0 +1,62 @@
+extern crate clap;
+extern crate rust_decimal;
+
+use clap::Parser;
+use rust_decimal::Decimal;
+use rust_decimal_macros::dec;
+
+use crate::{
+    config::Config,
+    db::{self, TaxDb},
+};
+
+#[derive(Parser, Debug)]
+pub struct InsertArgs {
+    #[clap(
+        short,
+        long,
+        help = "Decimal income value in BAM (will be rounded to 2 decimals) after deduction"
+    )]
+    deduced_income: Option<Decimal>,
+    #[clap(
+        short,
+        long,
+        help = "Decimal income value in BAM (will be rounded to 2 decimals)"
+    )]
+    income: Option<Decimal>,
+    #[clap(
+        long,
+        help = "Tax deduction percentage (20 default, 30 for income from authored work). Applied only when income is used and not deduced income",
+        default_value_t = dec!(20)
+    )]
+    deduction_percentage: Decimal,
+    #[clap(long, help = "Invoice date (YYYY-MM-DD)")]
+    invoice_date: String,
+}
+
+pub fn handle_command(config: Config, args: &InsertArgs) {
+    let income = match &args.income {
+        Some(inc) => {
+            let deduction_factor: Decimal =
+                dec!(1) - (args.deduction_percentage.round_dp(2) * dec!(0.01));
+            inc * deduction_factor
+        }
+        None => match &args.deduced_income {
+            Some(deduced_income) => deduced_income.clone(),
+            None => panic!("Provide either --income or --deduced_income!"),
+        },
+    };
+    // TODO: extract tax calculations into a common module
+    let health_insurance = income * dec!(0.04);
+    let tax_base = income - health_insurance;
+    let tax_amount: Decimal = tax_base * dec!(0.10);
+    let mut tax_db: TaxDb = db::parse_db_with_default(config.db_location.as_str());
+    tax_db.add_ams_info(
+        db::AmsInfo {
+            income_total: income,
+            tax_paid: tax_amount,
+        },
+        args.invoice_date.clone(),
+    );
+    tax_db.write_to_file(config.db_location.as_str());
+}
diff --git a/src/commands/db/load.rs b/src/commands/db/load.rs
new file mode 100644
index 0000000..b9098a9
--- /dev/null
+++ b/src/commands/db/load.rs
@@ -0,0 +1,42 @@
+extern crate clap;
+
+use clap::Parser;
+
+use crate::{
+    config::Config,
+    db::{self, TaxDb},
+    forms::amsform::{self, FormField},
+};
+
+#[derive(Parser, Debug)]
+pub struct LoadArgs {
+    #[clap(short, long)]
+    file: String,
+}
+
+pub fn handle_command(config: Config, args: &LoadArgs) {
+    let form = amsform::load_ams_form(args.file.clone());
+
+    let total_paid = form.get_number_field_value(FormField::TaxToPayTotal);
+    let income = form.get_number_field_value(FormField::TaxBaseTotal)
+        + form.get_number_field_value(FormField::HealthInsuranceTotal);
+
+    let invoice_date = [
+        form.get_text_field_value(FormField::PaymentDateYear),
+        "-".to_string(),
+        form.get_text_field_value(FormField::PaymentDateMonth),
+        "-".to_string(),
+        form.get_text_field_value(FormField::PaymentDateDay),
+    ]
+    .concat();
+
+    let mut tax_db: TaxDb = db::parse_db_with_default(config.db_location.as_str());
+    tax_db.add_ams_info(
+        db::AmsInfo {
+            income_total: income,
+            tax_paid: total_paid,
+        },
+        invoice_date,
+    );
+    tax_db.write_to_file(config.db_location.as_str());
+}
diff --git a/src/commands/db/mod.rs b/src/commands/db/mod.rs
new file mode 100644
index 0000000..afc381d
--- /dev/null
+++ b/src/commands/db/mod.rs
@@ -0,0 +1,30 @@
+extern crate clap;
+extern crate rust_decimal;
+
+mod insert;
+mod load;
+
+use crate::config::Config;
+use clap::{AppSettings, Parser, Subcommand};
+
+use self::{insert::InsertArgs, load::LoadArgs};
+
+#[derive(Parser, Debug)]
+#[clap(setting(AppSettings::SubcommandRequiredElseHelp))]
+pub struct DbArgs {
+    #[clap(subcommand)]
+    command: DbCommands,
+}
+
+#[derive(Subcommand, Debug)]
+enum DbCommands {
+    Load(LoadArgs),
+    Insert(InsertArgs),
+}
+
+pub fn handle_command(config: Config, args: &DbArgs) {
+    match &args.command {
+        DbCommands::Load(load_args) => load::handle_command(config, load_args),
+        DbCommands::Insert(insert_args) => insert::handle_command(config, insert_args),
+    }
+}
diff --git a/src/commands/mod.rs b/src/commands/mod.rs
index 1ef4aa4..9aff9f3 100644
--- a/src/commands/mod.rs
+++ b/src/commands/mod.rs
@@ -1,3 +1,4 @@
 pub mod ams;
+pub mod db;
 pub mod gpd;
 pub mod taxbreakdown;
diff --git a/src/forms/amsform.rs b/src/forms/amsform.rs
index 5c7c99a..4ac4fd4 100644
--- a/src/forms/amsform.rs
+++ b/src/forms/amsform.rs
@@ -219,6 +219,29 @@ impl AmsForm {
             .filter(|(k, _)| !k.is_empty())
             .collect()
     }
+
+    pub fn get_number_field_value(&self, field: FormField) -> Decimal {
+        Decimal::from_str_radix(self.get_text_field_value(field).as_str(), 10).unwrap()
+    }
+
+    pub fn get_text_field_value(&self, field: FormField) -> String {
+        println!(
+            "Loading text field {} of {}",
+            field as usize,
+            self.pdf_form.len()
+        );
+        match self.pdf_form.get_state(field as usize) {
+            pdf_forms::FieldState::Text {
+                text,
+                readonly,
+                required,
+            } => {
+                println!("Loaded text: {}", text);
+                text
+            }
+            _ => panic!("Unsupported field type!"),
+        }
+    }
 }
 
 pub fn load_ams_form(input_file: String) -> AmsForm {
diff --git a/src/main.rs b/src/main.rs
index 46f432f..2ffe0e6 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -9,6 +9,7 @@ mod format;
 mod forms;
 use clap::{AppSettings, Parser, Subcommand};
 use commands::ams::{self, AmsArgs};
+use commands::db::DbArgs;
 use commands::gpd::{self, GpdArgs};
 use commands::taxbreakdown::{self, TaxBreakdownArgs};
 use config::Config;
@@ -32,6 +33,7 @@ struct CliArgs {
 enum Commands {
     Ams(AmsArgs),
     Gpd(GpdArgs),
+    Db(DbArgs),
     TaxBreakdown(TaxBreakdownArgs),
 }
 
@@ -43,6 +45,7 @@ fn main() {
     match &args.command {
         Commands::Ams(ams_args) => ams::handle_command(config, ams_args),
         Commands::Gpd(gpd_args) => gpd::handle_command(config, gpd_args),
+        Commands::Db(db_args) => commands::db::handle_command(config, db_args),
         Commands::TaxBreakdown(tax_breakdown_args) => {
             taxbreakdown::handle_command(config, tax_breakdown_args)
         }